Soh
Wrote on facebook:

Without awareness there can be no objects, (there is no “unheard sound”) and without objects there can be no awareness, (seeing is dependently designated with “sight”) not because there are two distinctly existing things depending or interacting with each other but because they are merely dependently designated and have no existence of its own to speak of. For example you cannot speak of a sun without sunlight or a computer screen without the images, they are dependently designated and without any intrinsic existence. Just like a computer screen that doesn’t display images is not a computer screen, a knowing is labelled as such in dependence on the known, so both subject and object are severed - nondual clarity is vividly presencing as all appearances without needing to collapse subject into object or object into subject.

There is no denial of knowing known or “you” like there is no need to deny a conventional car. But if “you” or “knowing known” is just a label for vroomyumouch, just like car is merely imputed based on the parts and functions, then there is also no intrinsically (independent, changelessly) existing “you” or “car”. So you or car is not denied but simply a convenient label, so you can still use conventions but are not bound by them, just like when you talk about weather you don’t think of an entity but directly experience the rain falling wind blowing clouds forming and parting and so forth. When we say sensing we don’t get bound by subject action or object but directly sense the coolness, heat, softness and so forth.

The realisation of true mind, the luminous vivid presence is also important. But mind is no mind - empty of intrinsically existing entity. And being empty of mind, it is as dogen said,

“And just what is this wondrously pure, bright mind? It is the great earth with its mountains and rivers, along with the sun, the moon, and all the stars.”

....

Objects are merely conventionally and dependently designated as such. It cannot be understood apart from or excluding other conventions that make them meaningful otherwise it becomes erroneous (the same goes for everything - from self, to cars, to awareness, to whatever). A sound is not an object besides hearing, besides awareness - there is no such thing as an unheard sound. This part I believe you agree, the other part however in Buddhadharma's emptiness teaching is that awareness is also dependently designated in relation to what's experienced. So it's a two-way dependence unlike the one way dependence in Advaita. Hearer and hearing is only meaningful in reference to sound (and vice versa) - in truth there is no hearer, no hearing, no sound, the bell ringing has no subject or object -- direct immediacy of just this awareness as ringing.

But you'll interject, what about the formless consciousness that underlies and exists beneath, and in the absence of, thoughts and sensations? That pure infinite formless sense of Existence which is a mere formless sense that I AM? I too have realised that through self-inquiry a long time ago. But now I see that too is also another manifestation of consciousness, another face of Presence, no more and no less Presence than a sound, a sight, etc. It cannot be understood apart from manifestation, and apart from the conditions that defines it.


...

In my experience, manifestation is limitless. When walking, it's not legs walking, the entirety of everything is walking. Any sort of abiding, be it in the fiction of a subject or an object, even in a grasped image of 'infinite formless consciousness', is still limitations

...

You're saying there is an ocean independent of its wave (a limitation) reflecting back on itself without investment in wave. I'm saying the wave is none other than the entirety of the ocean, including the conditions that makes it wave - the wind, etc

To me, the latter is 'more' 'limitless'


Soh

Taken from http://dogenandtheshobogenzo.blogspot.sg/2011/02/zazen-polishing-tile-to-make-mirror.html

Zazen-Only - Polishing Tiles, Making Buddhas
...
The perfection of each person is unique; a particular human becomes a Buddha when that human wholly becomes that particular human. The Buddhahood of an individual being is the perfection of the “integral character” of that particular being “as it is.” Zazen-only is the perfection of the “normal mind,” that is, a particular body-mind that is fully seated in and as the wholeness of its particular existence ceaselessly advancing in harmony with the true nature of its own integral character. One of the clearest of Dogen’s numerous presentations of this aspect of the Buddha Dharma is revealed in one of his masterly commentaries on a classic Zen koan.

One day when Nangaku came to Baso’s hut, Baso stood up to receive him. Nangaku asked him, “What have you been doing recently?”

Baso replied, “Recently I have been doing the practice of seated meditation exclusively.”

Nangaku asked, “And what is the aim of your seated meditation?”

Baso replied, “The aim of my seated meditation is to achieve Buddhahood.”

Thereupon, Nangaku took a roof tile and began rubbing it on a rock near Baso’s hut.

Baso, upon seeing this, asked him, “Reverend monk, what are you doing?”

Nangaku replied, “I am polishing a roof tile.”

Baso then asked, “What are you going to make by polishing a roof tile?”

Nangaku replied, “I am polishing it to make a mirror.”

Baso said, “How can you possibly make a mirror by rubbing a tile?”

Nangaku replied, “How can you possibly make yourself into a Buddha by doing seated meditation?”

For hundreds of years now, many people have held the view that, in this story, Nangaku is earnestly endeavoring to encourage Baso in his practice. This is not necessarily so, for, quite simply, the daily activities of the great saintly teacher were far removed from the realm of ordinary people. If great saintly teachers did not have the Dharma of polishing a tile, how could they possibly have the skillful means to guide people? Having the strength to guide people is the Bones and Marrow of an Ancestor of the Buddha. Even though the tile was the thing that came to hand, still, it was just an everyday, household object. If it were not an everyday object or some household utensil, then it would not have been passed on by the Buddha’s family. What is more, its impact on Baso was immediate. Be very clear about it, the functioning of the True Transmission of Buddhas and Ancestors involves a direct pointing. We should truly comprehend that when the polished tile became a mirror, Baso became Buddha. And when Baso became Buddha, Baso immediately became the real Baso. And when Baso became the real Baso, his sitting in meditation immediately became real seated meditation. This is why the saying ‘polishing a tile to make a mirror’ has been preserved in the Bones and Marrow of former Buddhas.

Thus it is that the Ancient Mirror was made from a roof tile. Even though the mirror was being polished, it was already without blemish in its unpolished state. The tile was not something that was dirty; it was polished simply because it was a tile. On that occasion, the virtue of making a Mirror was made manifest, for it was the diligent effort of an Ancestor of the Buddha. If polishing a tile did not make a Mirror, then even polishing a mirror could not have made a Mirror. Who can surmise that in this act of making, there is the making of a Buddha and there is the making of a Mirror?

Further, some may wonder, “When the Ancient Mirror is polished, can It ever be polished into a tile?” Your state of being—your breathing in and breathing out—when you are engaged in polishing is not something that you can gauge at other times. And Nangaku’s words, to be sure, express what is expressible. As a result, in the final analysis, he was able to polish a tile and make a Mirror. Even we people of the present time should try to pick up today’s ‘tile’ and give it a polish, for ultimately it will become a Mirror. If a tile could not become a Mirror, people could not become Buddha. If we belittle tiles as being lumps of clay, we will also belittle people as being lumps of clay. If people have a Heart, then tiles too will have a Heart. Who can recognize that there is a Mirror in which, when a tile comes, the Tile appears? And who can recognize that there is a Mirror in which, when a mirror comes, the Mirror appears?
Shobogenzo, Kokyo, Hubert Nearman


The "ancient mirror" is the Buddha mind; more specifically, it is an aspect or quality of the Buddha mind that is traditionally referred to as the "universal mirror prajna." The “universal mirror prajna” is the first of the “four prajna's (or “cognitions”) of Buddhahood.” This prajna is described as the aspect of mind that, like a mirror, perfectly reflects the world as it is in the immediate present – the world in its ‘thusness.’ Unlike an ordinary mirror, this prajna is not only reflective, it is also luminescent. It is the initial realization of this “prajna” (or “cognition”) that is traditionally regarded as the practitioners entrance into awakening (often called "kensho" in Zen).

Dogen’s commentary on the koan illumines the same principle informing his teaching that “clear seeing is prajna itself” – here the principle is formulated as “when the polished tile became a mirror Baso became Buddha.”

A “tile” is only a tile by virtue of being experienced as a mind-form unity (dharma) as it is. In the koan, “Baso” is only Baso (his true self; Buddha) by virtue of experiencing mind-forms as they are. When “the tile became a mirror Baso became Baso” – Baso became Baso (his true self; Buddha) when the tile became a mirror (its true self; a mind-form). Moreover, because the mirror (that which verifies) is never separate from the tile (that which is verified), the mirror (Baso) was actualized as a real mirror (the real Baso) by virtue of experiencing the tile.

In terms of the prajna paramita literature, tile and mirror (forms) is emptiness, Baso is Buddha, emptiness is tile and mirror, Buddha is Baso; therefore, emptiness is emptiness, tile is tile, mirror is mirror, Buddha is Buddha, Baso is Baso. When Baso is Baso the whole universe is solely Baso; when zazen is zazen, the whole universe is solely sitting.

In Dogen’s view, the only reality is reality that is actually experienced as particular things at specific times. There is no “tile nature” apart from actual “tile forms,” there is no “essential Baso” apart from actual instances of “Baso experience.” When Baso sits in zazen, “zazen” becomes zazen, and “Baso” becomes Baso. Real instances of Baso sitting in zazen is real instances of Baso and real instances of zazen – when Baso eats rice, Baso is really Baso and eating rice is really eating rice.
...
Peace,
Ted
Soh
I like this quote but does anyone know who translated it and the source of that text?



Subhuti asked: "Is perfect wisdom beyond thinking? Is it unimaginable and totally unique but nevertheless reaching the unreachable and attaining the unattainable?"

The Buddha replied: "Yes, Subhuti, it is exactly so. And why is perfect wisdom beyond thinking? It is because all its points of reference cannot be thought about but can be apprehended. One is the disappearance of the self-conscious person into pure presence. Another is the knowing of the essenceless essence of all things in the world. And another is luminous knowledge that knows without a knower. None of these points can sustain ordinary thought because they are not objects or subjects. They can't be imagined or touched or approached in any way by any ordinary mode of consciousness, therefore they are beyond thinking."
Soh
"Bodhidharma asked, "Can each of you say something to demonstrate your understanding?"
Dao Fu stepped forward and said, "It is not bound by words and phrases, nor is it separate from words and phrases. This is the function of the Tao."
Bodhidharma: "You have attained my skin."
The nun Zong Chi[note 6][note 7] stepped up and said, "It is like a glorious glimpse of the realm of Akshobhya Buddha. Seen once, it need not be seen again."
Bodhidharma; "You have attained my flesh."
Dao Yu said, "The four elements are all empty. The five skandhas are without actual existence. Not a single dharma can be grasped."
Bodhidharma: "You have attained my bones."
Finally, Huike came forth, bowed deeply in silence and stood up straight.
Bodhidharma said, "You have attained my marrow." [38]"

Soh
Also see: Luminosity vs Clarity
The Sun Does Not Rise or Set

The Unbounded Field of Awareness
Jax's Message
Fully Experience All-Is-Mind by Realizing No-Mind and Conditionality


To find a buddha, all you have to do is see your nature. Your nature is the buddha. And the buddha is the person who's free, free of plans, free of cares. If you don't see your nature and run around all day looking somewhere else, you'll never find a buddha. The truth is there's nothing to find. Life and death are important. Don't suffer them in vain. There's no advantage in deceiving yourself. Even if you have mountains of jewels and as many servants as there are grains of sand along the Ganges, you see them when your eyes are open. But what about when your eyes are shut? You should realize that everything you see is like a dream or illusion.

Buddha is Sanskrit for what you call aware, miraculously aware. Responding, perceiving, arching your brows, blinking your eyes, moving your hands and feet, it's all your miraculously aware nature. And this nature is the mind. And the mind is the buddha. And the buddha is the path. And the path is zen. But the word zen is one that remains a puzzle to both mortals and sages. Seeing your nature is zen. Unless you see your nature, it's not zen.

Bodhidharma (440-528)
Soh
Jamgon Mipham:

Accordingly, in the case of a beginner, it is possible for mere nonexistence (med rkyang tsam), the negation of truly existent phenomena, to arise as a mental object. But a person whose Madhyamaka investigation has hit the mark will perfectly distinguish the difference between the lack of inherent existence and mere nonexistence; and will be quite certain that a phenomenon's lack of inherent existence is inseparable from its dependent arising. Such an extraordinary mode of apprehension indeed acts as an antidote to the precipitous extremes of both substantialism and nihilism. For as long as, according to one's mode of apprehension, one is either refuting things or establishing them, one is not actually in the nature beyond all conceptual extremes. When, with reasoned analysis, one arrives at the certainty that phenomena do not dwell in any of the four extremes, and when one settles evenly in the dharmadhatu, by way of the self-cognizing primordial wisdom, this will have the power to dispel all conceptual constructs. Thus one will gain confidence in ultimate reality, in 'which there are no misconceptions to dispel and no progress to make. One will have confidence in the genuine meaning of "freedom from mental activity" as explained in the Prajnaparamita-sutra.
Soh
Wrote to someone:

The red petals are not red petals of an inherently existing flower. Flower is conventionally designated in dependence on the petals, there is no flower core anywhere. So it might be more accurate to say the petals “are” the flower. Even the red appearance is dependently originating with no real substance to be found, I.e. unreal - dogs don’t see red, so it is a nonoriginating reflection/appearance in any case, like the reflection of the moon on water, only appearing in dependence on certain conditions but never actually referring to an actual thing being created or abiding or ceasing anywhere. Like scrolling through facebook posts or watching a movie, no actual things or persons or objects are created despite their appearances. This is not to say "what you see is all there is" but "what you see does not amount to something truly existing or truly arising" and whatever "things" - self, cup, table, sky, car, flower, are all conventionally designated in dependence on parts, conditions, functions, designating consciousness and when analysed no true existence can be found.

The universe is like that. Nothing that appears in dependence on conditions exists intrinsically by its own power or essence. But of course it is not a rejection of phenomena and its causal efficacy, as explained in the chapter on the four noble truths in madhyamikakarika. It is precisely because conventional empty phenomena are not intrinsically existing that they could arise due to conditions and cease through practicing the path, otherwise they would be forever “there” like a moon in the lake would be stuck there if it were real and intrinsic. So we have to understand emptiness through dependent origination and understand the causal efficacy of conventional empty phenomena, otherwise we are falling into nihilism and rejecting the four noble truths, etc.

When we talk about illusion, there is a difference between water-moon and rabbit-horn. Appearances are like water-moon being dependently originated, without substance and base but not non-existent, whereas true existence/inherent existence is illusory in the sense of being "horns of rabbits", it does not exist even conventionally. If we merely see non-existence, or negate conventionalities and their valid functionalities, that is nihilism. The sun, even if hidden behind the clouds and thus "unseen", is still exerting a causal function of heating up the earth. On the other hand if we treat these things (e.g. the sun) as real and substantial instead of dependently designated/dependently originating and thus unreal, then we are having substantialist tendencies. The sun is also designated in dependence on its functions like 'heat', just like the flower is designated in dependence on the petals, and other conditions. So seeing this, we do not think of the sun as a substantial thing causing a substantial thing to happen, for the heating and sun are dependently designated. But that is not to deny "sun" or "heating" conventionally and their causal efficacy.

"In brief from empty phenomena
Empty phenomena arise;
Agent(cause), karma(action), fruits(effect), and their enjoyer(subject) -
The conqueror taught these to be [only] conventional.

Just as the sound of a drum as well as a shoot
Are produced from a collection [of factors],
We accept the external world of dependent origination
To be like a dream and an illusion.

That phenomena are born from causes
Can never be inconsistent [with facts];
Since the cause is empty of cause,
We understand it to be empty of origination."

- Nāgārjuna
.....

“Earlier we saw that both the Vaibhāṣika and Sautrāntika argue that only ultimately intrinsic reality (svabhāva) enables things to perform a causal function (arthakriya). The Svātantrika Madhyamaka rejects this, and it instead argues that things are causally efficient because of their conventionally intrinsic reality (svabhāva) or unique particularity (svalakṣaṇa). The Prāsaṅgika Madhyamaka, however, rejects both these positions, and argues only what is conventionally non-intrinsic reality (niḥsvabhāva) is causally effective, for only those phenomena, the conventional nature of which is non-intrinsic, are subject to conditioned or dependent arising. Conventional reality (here treated as dependently arisen phenomenon), given it is causally effective, is therefore always intrinsically unreal, and hence lacks any intrinsic reality even conventionally. Hence that which is conventionally (or dependently) coarisen is always conventionally (or dependently) arisen and strictly does not arise ultimately.”

"Nāgārjuna's central argument to support his radical non-foundationalist theory of the two truths draws upon an understanding of conventional truth as tied to dependently arisen phenomena, and ultimate truth as tied to emptiness of the intrinsic nature. Since the former and the latter are coconstitutive of each other, in that each entials the other, ultimate reality is tied to being that which is conventionally real. Nāgārjuna advances important arguments justifying the correlation between conventional truth vis-à-vis dependent arising, and emptiness vis-à-vis ultimate truth. These arguments bring home their epistemological and ontological correlations ([MMK] 24.14; Dbu ma tsa 15a). He argues that wherever applies emptiness as the ultimate reality, there applies the causal efficacy of conventional reality and wherever emptiness does not apply as the ultimate reality, there does not apply the causal efficacy of conventional reality (Vig.71) (Dbu ma tsa 29a). According to Nāgārjuna, ultimate reality's being empty of any intrinsic reality affords conventional reality its causal efficacy since being ultimately empty is identical to being causally produced, conventionally. This must be so since, for Nāgārjuna, “there is no thing that is not dependently arisen; therefore, there is no such thing that is not empty” ([MMK] 24.19, Dbu ma tsa 15a)."

- https://plato.stanford.edu/entries/twotruths-india/
Soh


For Zen Master Seung Sahn’s enlightenment story, see https://kwanumzen.org/teaching-library?author=599de3933e00be59c1734e28

Wrote to someone,

“Recently been reading Zen Master Seung Sahn. He is also very clear. The teachers in his lineage teaching in the Singapore dharma center Kwan Yin Chan Lin are also consistently clear in terms of realisation of anatta.

As I wrote:

What’s important is that the insight must be clear. The teachings must be clear. It’s impossible to overcome the propensities of dualism without the correct insights. I’m not bothered about the terms, words they use or even whether he or she is unconventional or traditional.

For example, recently I started reading Zen Master Seung Sahn writings. I noticed that although he uses the term true self a lot, his insights are clearly anatta. He is not talking about a background or ultimate self behind everything.

Seung Sahn said “your true self has no outside, no inside. Sound is clear mind, clear mind is sound. Sound and hearing are not separate, there is only sound.”

Thusness also said, “Seung Sahn is anatta. Self/self is not important to him at all””

(Update by Soh: we are mistaken about this. See http://www.awakeningtoreality.com/2021/07/this-is-impersonality-aspect-not-anatta.html)

Nowadays OCR softwares are very powerful. I took a photo of a page from a book using my phone, used the free app Office Lens to convert the image into text in word document. It is fast and accurate.

Here’s a teaching by Zen Master Seung Sahn which is converted using OCR, it’s from the book  “Only Don’t Know: The Teaching Letters of Zen Master Seung Sahn”, also it’s somewhat relevant to my previous encounter with a Zen Master from this lineage (See Total Exertion):

WHAT IS STRONG SITTING?

Toronto, Canada
January 29, 1977

Dear Soen Sa Nim,

I miss you very much and wish that I did not live so far away from you. Every day I sit Zen and bow 108 times— Lawlor and I do this together. But often when I'm bowing and sitting, I am thinking:

"What will I make for dinner? What shall I wear to work? Thinking is no good." All thinking!

You say—"Put it all down. Only go straight." But isn't there some balance about practice? Maybe I should do more sitting. You talk about strong sitting. What is this?

What am I? I ask this more and more through my day. But there is so much thinking!

I hope you are well, and I send you my great love.

Sherry

February 22, 1977

Dear Sherry,

How are you? Thank you for your letter.

You told me that you and Lawlor have been practicing  gether every day—that is wonderful. A lot of thinking, no thinking, a little thinking—it doesn't matter. You say, "thinking is no good." This is no good. This is being attached to your thinking. Only try, try, try, and your thinking will rest. Then finally, at bowing time, only bow; at sitting time, only sit; at chanting time, only chant. This is possible. If you keep practicing, this will happen.

In your letter you asked me about balance in your practice and about strong sitting. If you are attached to something, your mind and your body will be unbalanced. If you don't make anything, your mind and your body become one, and will be perfectly balanced, and everything will be complete and clear.

Strong sitting means not checking your mind and feelings. At times everyone has many thoughts and feelings while sitting. This is correct. Don't worry. But many people check themselves. "I am no good. What do other people think of me? I am always thinking. How can I cut off all thinking? How do you only go straight? How do you put it all down?" This is being attached to thinking. Thinking itself is not bad or good Just don't be attached to thinking. Don't worry about every. thing. Thinking is thinking; feeling is feeling. Don't touch. Only go straight—don't know. That is strong sitting.

If you keep this strong-sitting mind, your mind will be clear moment to moment. Clear mind means keeping your correct situation. When you drive, just drive. Then when you come to a red light, stop. When it turns green, go. That is the correct situation. Correct situation means just-like-this.

I understand your mind. Your mind constantly checks your mind. But if you practice and try every day, your checking mind will rest, and you will be able to keep a just-like-this mind. Then when you see the sky, only blue; when you see a tree, only green. Your mind is still. Then saving all beings is possible.

I hope you only go straight— don't know, keep a mind which is clear like space, attain Enlightenment, and save all beings from suffering.

Yours in the Dharma,

S. S.




You can find many similar teachings by him in https://kwanumzen.org/resources-collection/2017/9/15/teaching-letters-of-zen-master-seung-sahn
Soh
Zen Student: Could you speak about when you sit zazen away from Zen Center, and you sit alone? Could you speak about that?
Suzuki-rōshi: Oh, sit alone. By yourself? True zazen, you know, cannot be sit by yourself, you know. That you sit there means that every one of us [is] sitting with you. That kind of zazen is true zazen. Even though you are sitting in Japan or Tibet, you know, you are sitting with all the people in the world. That kind of feeling you must have in your zazen. You include — your practice include everything. That is our practice, you know. When you are you on your cushion, everyone sitting on their own cushion. That is our zazen.
*************
Uji Koan, 3:
The way the self arrays itself is the form of the entire world. See each thing in this entire world as a moment of time.
Things do not hinder one another, just as moments do not hinder one another. The way-seeking mind arises in this moment. A way-seeking moment arises in this mind. It is the same with practice and with attaining the way. Thus the self setting itself out in array sees itself. This is the understanding that the self is time.
Soh
Malcolm's translation:

“Hey, hey, apparent yet nonexistent retinue: listen well! There is no object to distinguish in me, the view of self-originated wisdom; it did not exist before, it will not arise later, and also does not appear in anyway in the present. The path does not exist, action does not exist, traces do not exist, ignorance does not exist, thoughts do not exist, mind does not exist, prajñā does not exist, samsara does not exist, nirvana does not exist, vidyā itself does not even exist, totally not appearing in anyway.”
-- Unwritten Tantra

Soh
Kyle Dixon shared:

= The Importance of Emptiness and Nāgārjuna's Madhyamaka in Dzogpachenpo =

From Khenpo Tsultrim Gyamtso:

"Furthermore, since one must rely on Nagarjuna’s reasonings in order to realize the essence of Dzogchen, it is the same for Mahamudra. Those who studied at the shedras (philosophical universities) in Tibet studied 'The Fundamental Wisdom of the Middle Way' and Chandrakirti’s 'Entering the Middle Way' and other similar texts over the course of many years. Mahamudra and Dzogchen were not studied, however, because it is the Middle Way texts that are filled with such a vast array of different arguments and logical reasonings that one can pursue the study of them in a manner that is both subtle and profound. 

In the Mahamudra teachings as well, we find statements such as this one from Karmapa Rangjung Dorje’s Mahamudra Aspiration Prayer:

'As for mind, there is no mind! Mind is empty of essence'
If you gain certainty in mind’s emptiness of essence by analyzing it with the reasoning that refutes arising from the four extremes and with others as well, then your understanding of Mahamudra will become profound. Otherwise, you could recite this line, but in your mind it would be nothing more than an opinion or a guess.

If you study these reasonings presented in 'The Fundamental Wisdom of the Middle Way', when you receive Mahamudra and Dzogchen explanations of emptiness and lack of inherent reality, you will already be familiar with what is being taught and so you will not need to learn anything new. Mipham Rinpoche composed a brief text called 'The Beacon of Certainty', in which he states: 'In order to have perfect certainty in "kadag" (primordial purity) one must have perfect understanding of the view of the Consequence or Prasangika school. Kadag, or original, primordial purity, is the view of Dzogchen, and in order to perfect that view, one must perfect one’s understanding of the Middle Way Consequence or Prasangika school’s view. What this implies is that the view of Dzogchen kadag and the view of the Consequence or Prasangika of Chandrakirti's school are the same."
From Tulku Tsullo's instruction on the view of Dzogchen:
"Therefore, whether in sutra or in tantra, there is consensus that the only direct antidote to the ignorance of clinging to things as real - which lies at the root of our karma and disturbing emotions - is the wisdom that realizes emptiness. So for Dzogchen practitioners, too, it is extremely important to realize emptiness."
The sgra thal gyur tantra states:
"Nonexistent therefore appearing, appearing therefore empty. The inseparable union of appearance and emptiness with its branches."
Zilnon Zhepa Tsal said:

"How could liberation be attained without realizing emptiness? And how could emptiness be realized without the Great Perfection [Dzogchen]? Who but I offers praise such as this?"
The Dalai Lama states:

"We need a special form of wisdom - the wisdom that realizes emptiness - to act as the direct antidote to the cognitive obscurations. Without this wisdom, which can be realized through the Great Perfection... we will not have the direct antidote to the cognitive obscurations. So this point is conclusive."
Khenchen Rigdzin Dorje [Chatral Rinpoche's heart disciple] states:
"The Madhyamika consider the Prasangik as the perfect Rangtong view. The Dzogchen trekcho view as Kadag (primordially pure view) and the Prasangik view is the same. The emptiness is the same, there is no difference... It is important to understand that the words primordially pure [kadag] is the Dzogchen terminology for the Prasangic Emptiness. [The ancient Nyingmapa Masters like Long Chenpa, Jigme Lingpa, Mipham, were] Prasangikas [Thalgyurpas]... the Prasangika Madhyamika sunyata [tongpanyid] and the Dzogchen sunyata are exactly the same. There is no difference. One hundred percent [the] same."
Longchenpa says:

"This system of the natural great perfection is equivalent with the Consequentialist [Prasangika] Madhyamaka’s usual way of considering freedom from extremes and so on. However, emptiness in Madhymaka is an emptiness counted as similar to space, made into the basis; here [in Dzogchen] naked pellucid vidyā pure from the beginning that is not established; that, merely unceasing, is made into the basis. - The phenomena that arise from the basis are apprehended as being free from extremes, like space."
David Germano:
"While a detailed analysis of the relationship of these classical Great Perfection texts to the Madhyamaka Prasangika tradition is quite beyond the scope of my present discussion, at this point I would merely like to indicate that even in The Seventeen Tantras (i.e. without considering Longchenpa's corpus) it is very clear that the tradition embodies an innovative dialectical reinterpretation of the Prasangika notions of emptiness, rather than a mere sterile 'diametric opposition' to them that Karmay suggests."

Ju Mipham Rinpoche states in his Madhyamakālaṃkāra:
"Without finding certainty in primordial purity (ka dag), just mulling over some 'ground that is neither existent nor nonexistent' will get you nowhere. If you apprehend this basis of emptiness that is empty of both existence and nonexistence as something that is established by its essence separately [from everything else], no matter how you label it (such as an inconceivable self, Brahmā, Visnu, Īśvara, or wisdom) except for the mere name, the meaning is the same. Since the basic nature free from the reference points of the four extremes, that is, Dzogchen (the luminosity that is to be personally experienced) is not at all like that, it is important to rely on the correct path and teacher. Therefore, you may pronounce 'illusionlike,' 'nonentity,' 'freedom from reference points,' and the like as mere verbiage, but this is of no benefit whatsoever, if you do not know the [actual] way of being of the Tathāgata’s emptiness (which surpasses the limited [kinds of] emptiness [asserted] by the tīrthikas) through the decisive certainty that is induced by reasoning."

Chögyal Namkhai Norbu states:

"...Madhyamaka explains with the four 'beyond concepts,' which are that something neither exists, nor does not exist, nor both exists and does not exist, nor is beyond both existing and not existing together. These are the four possibilities. What remains? Nothing. Although we are working only in an intellectual way, this can be considered the ultimate conclusion in Madhyamaka. As an analytical method, this is also correct for Dzogchen. Nagarjuna's reasoning is supreme."
and, 

"That view established intellectually we need to establish consciously in dependence upon one’s capacity of knowledge and on convention. The way of establishing that is the system of Prasanga Madhyamaka commented upon by the great being Nāgārjuna and his followers. There is no system of view better than that."

From Jigme Lingpa:

"I myself argue ‘To comprehend the meaning of the non-arising baseless, rootless dharmakāya, although reaching and the way of reaching this present conclusion 'Since I have no thesis, I alone am without a fault', as in the Prasanga Madhyamaka system, is not established by an intellectual consideration such as a belief to which one adheres, but is reached by seeing the meaning of ultimate reality of the natural great completion."

Chokyi Dragpa states:

On the path of trekchö, all the rigidity of mind's clinging to an "I" where there is no "I", and a self where there is no self, is cut through with Madhyamika Prasangika reasoning and the resulting conviction that an "I" or a "self" does not exist. Then, by examining where mind arises, dwells and ceases, you become certain of the absence of any true reality."

Again from Khenpo Tsultrim Gyamtso:

"The great scholar and master, Mipham Chokle Namgyal, said, 'If one seeks to master the basic nature of alpha purity, or kadak, it is necessary to perfect one’s understanding of the view of the Prasangika, or the Consequence School.' Alpha purity describes the basic nature of mind as it is expressed in the dzogchen descriptions. If one wishes to realize dzogchen, alpha purity, or trekcho, as it is also called, then one must perfect one’s understanding of the Consequence School. That is, one must realize that the nature of reality transcends all conceptual fabrications; it cannot be described by any conceptual terms. This is the aspect of the 'expanse.' If one recognizes this, then it is easy to realize the mahamudra because, as Milarepa sang:

'The view is original wisdom which is empty
Meditation clear light free of fixation
Conduct continual flow without attachment
Fruition is nakedness stripped of every stain.'"

From Acarya Dharmavajra Mr. Sridhar Rana:

"The meaning of Shunyata found in Sutra, Tantra Dzogchen, or Mahamudra is the same as the Prasangic emptiness of Chandrakirti, i. e. unfindability of any true existence or simply unfindability. Some writers of Dzogchen and Mahamudra or Tantra think that the emptiness of Nagarjuna is different from the emptiness found in these systems. But I would like to ask them whether their emptiness is findable or unfindable; whether or not the significance of emptiness in these systems is also not the fact of unfindability- no seeing as it could also be expressed. Also some Shentong scholars seem to imply that the Shentong system is talking about a different emptiness. They say Buddha nature is not empty of qualities therefore, Buddha nature is not merely empty, it also has qualities. First of all the whole statement is irrelevant. Qualities are not the question and Buddha nature being empty of quality or not is not the issue. The Buddha nature is empty of Svabhava (real existence). Because it is empty of real existence, it has qualities. As Arya Nagarjuna has said in his Mula Madhyamika Karika: 'All things are possible (including qualities) because they are empty', Therefore the whole Shentong/ Rangtong issue is superfluous. However, in Shentong, Buddha nature is also empty and emptiness means unfindable. In short, the unfindability of any true existence is the ultimate (skt. paramartha) in Buddhism, and is diametrically opposed to the concept of a truly existing thing called Brahman, the ultimate truth in Hinduism."

from Dzogchen Ponlop Rinpoche:

"The practice of tregcho is essential when it comes to realizing the originally pure nature of mind and phenomena. This nature is emptiness, the basic state of the Great Perfection. For this reason, a thorough grounding in the view of Madhyamaka can be a great help when receiving instructions on tregcho. With the correct view of emptiness, one can meditate effectively on original purity [ka dag]."

and a final warning from Khenpo Tsultrim Gyamtso:

"If we still believe in existence, if we have some type of belief in something substantial, if we think that there is something that truly exists, whatever it might be, then we are said to fall into the extreme called eternalism or permanence. And if we fall into that extreme, we will not realize the true nature of reality."