Comments by AEN: the following article states the three stages of experience the practitioner goes through during his practice (1: relaxing mind and body, 2: the Great Self, 3: No Self). It also distinguishes the I AM and One Mind stage (stage one to four) from the experience of No Mind (stage five) as described by Thusness/PasserBy in 
Thusness's Seven Stages of Experience
An few important excerpts by Master Sheng Yen:
...By the practise of Ch’an one can eliminate the ‘I’; not only  the selfish, small ‘I’, but also the large ‘I’, which in philosophy is called  ‘Truth’ or ‘the Essence’. Only then is there absolute freedom...
...When you are in the second stage, although you feel that                         the ‘I’ does not exist, the basic substance of the universe, or the                         Supreme Truth, still exists. Although you recognise that all the                         different phenomena are the extension of this basic substance or                         Supreme Truth, yet there still exists the opposition of basic                         substance versus external phenomena...
 ... One who has entered Ch’an does not see basic                         substance and phenomena as two things standing in opposition to                         each other. They cannot even be illustrated as being the back and                         palm of a hand. This is because phenomena themselves are basic                         substance, and apart from phenomena there is no basic substance to                         be found. The reality of basic substance exists right in the                         unreality of phenomena, which change ceaselessly and have no                         constant form. This is the Truth...
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Full article:
http://www.abuddhistlibrary.com/Buddhism/C%20-%20Zen/Modern%20Teachers/Sheng%20Yen/What%20is%20Ch%27an/What%20is%20Ch%27an%20-%20Master%20Sheng-yen.htm
A lecture by Master Sheng-yen (1977)
In 1977 Shi-fu was at the very beginning of his teaching  career in America. He was invited to give talks in various places and these were  admirably translated. In this talk the crisp vision of Ch’an that Shi-fu was  bringing from China and from the Japan of his final training is clear for all to  see. As we set about creating a Ch’an suitable for Europe this lecture has  striking and helpful cogency. It was published in a small pamphlet of which  probably only a few remain. Tim Paine was rummaging through the library at  Maenllwyd when he came across it and spotted its excellence. It was in fact one  of the inspirations for John’s first visits to the New York Ch’an Centre. We are  glad Tim uncovered it again and we trust our readers will find it equally  inspiring. Shi-fu permits us to reproduce it here. Eds. 
I wish to start by telling you that Ch’an is not the same as  knowledge, yet knowledge is not completely apart from Ch’an. Ch’an is not just  religion, yet the achievements of religion can be reached through Ch’an. Ch’an  is not philosophy, yet philosophy can in no way exceed the scope of Ch’an. Ch’an  is not science, yet the spirit of emphasising reality and experience is also  required in Ch’an. Therefore, please do not try to explore the content of Ch’an  motivated by mere curiosity, for Ch’an is not something new brought here [to the  USA] by Orientals; Ch’an is present everywhere, in space without limit and time  without end. However before the Buddhism of the East was propagated in the  western world, the people of the West never knew of the existence of Ch’an. The  Ch’an taught by Orientals in the West is not, in fact, the real Ch’an. It is the  method to realise Ch’an. Ch’an was first discovered by a prince named Siddhartha  Gautama (called Shakyamuni after his enlightenment), who was born in India about  2500 years ago. After he became enlightened and was called a Buddha, he taught  us the method to know Ch’an. This method was transmitted from India to China,  and then to Japan. In India it was called dhyana, which is pronounced ‘Ch’an’ in  Chinese, and ‘Zen’ in Japanese. Actually, all three are identical. 
Ch’an has universal and eternal existence. It has no need of  any teacher to transmit it; what is transmitted by teachers is just the method  by which one can personally experience this Ch’an. 
Some people mistakenly understand Ch’an to be some kind of  mysterious experience; others think that one can attain supernatural powers  through the experience of Ch’an. Of course, the process of practising Ch’an  meditation may cause various kinds of strange occurrences on the level of mental  and physical sensation; and also, through the practice of unifying body and  mind, one may be able to attain the mental power to control or alter external  things. But such phenomena, which are looked upon as mysteries of religion, are  not the aim of Ch’an practice, because they can only satisfy one’s curiosity or  megalomania, and cannot solve the actual problems of peoples lives. 
Ch’an starts from the root of the problem. It does not start  with the idea of conquering the external social and material environments, but  starts with gaining thorough knowledge of one’s own self. The moment you know  what your self is, this ‘I’ that you now take to be yourself will simultaneously  disappear. We call this new knowledge of the notion of self ‘enlightenment’ or  ‘seeing ones basic nature’. This is the beginning of helping you to thoroughly  solve real problems. In the end, you will discover that you the individual,  together with the whole of existence, are but one totality which cannot be  divided. 
Because you yourself have imperfections, you therefore feel the  environment is imperfect. It is like a mirror with an uneven surface, the images  reflected in it are also distorted. Or, it is like the surface of water  disturbed by ripples, the moon reflected in it is irregular and unsettled. If  the surface of the mirror is clear and smooth, or if the air on the surface of  the water is still and the ripples calmed, then the reflection in the mirror and  the moon in the water will be clear and exact. Therefore, from the point of view  of Ch’an, the major cause of the pain and misfortune suffered by humanity is not  the treacherous environment of the world in which we live, nor the dreadful  society of humankind, but the fact that we have never been able to recognise our  basic nature. So the method of Ch’an is not to direct us to evade reality, nor  to shut our eyes like the African ostrich when enemies come, and bury our heads  in the sand, thinking all problems are solved. Ch’an is not a self-hypnotising  idealism. 
By the practise of Ch’an one can eliminate the ‘I’; not only  the selfish, small ‘I’, but also the large ‘I’, which in philosophy is called  ‘Truth’ or ‘the Essence’. Only then is there absolute freedom. Thus an  accomplished Ch’an practitioner never feels that any responsibility is a burden,  nor does he feel the pressure that the conditions of life exert on people. He  only feels that he is perpetually bringing the vitality of life into full  activity. This is the expression of absolute freedom. Therefore the life of  Ch’an is inevitably normal and positive, happy and open. The reason for this is  that the practise of Ch’an will continually provide you with a means to excavate  your precious mine of wisdom. The deeper the excavation, the higher the wisdom  that is attained, until eventually you obtain all the wisdom of the entire  universe. At that time, there is not a single thing in all of time and space  that is not contained within the scope of your wisdom. At that stage wisdom  becomes absolute; and since it is absolute, the term wisdom serves no further  purpose. To be sure, at that stage the ‘I’ that motivated you to pursue such  things as fame, wealth and power, or to escape from suffering and danger, has  completely disappeared. What is more, even the wisdom which eliminated your ‘I’  becomes an unnecessary concept to you. 
Of course, from the viewpoint of sudden enlightenment it is  very easy for a Ch’an practitioner to reach this stage; nevertheless before  reaching the gate of sudden enlightenment one must exert a great deal of effort  on the journey. Otherwise the methods of Ch’an would be useless. 
The Three Stages of Ch’an Meditation
At present [1977], the methods of meditation that I am teaching  in the United States are divided into three stages. 
Stage 1: To balance the development of body and mind in order to  attain mental and physical health
With regard to the body, we stress the demonstration and  correction of the postures of walking, standing, sitting and reclining. At the  same time we teach various methods of physical exercise for walking, standing,  sitting and reclining. They are unique exercise methods combining Indian Hatha  Yoga and Chinese Tao-yin, and can bring physical health as well as results in  meditation. Thus, one who practises Ch’an and has obtained good results will  definitely have a strong body capable of enduring hardship. For the mind we  emphasise the elimination of impatience, suspicion, anxiety, fear and  frustration, so as to establish a state of self-confidence, determination,  optimism, peace and stability. 
A good student, after five or ten lessons here, will reach the  first stage and be able to obtain results in the above two areas. One of our  student’s reports stated: “This kind of Ch’an class is especially good for  someone like myself who, by profession or habit, has been used to having the  brain functioning just about every minute of the day. I often find this Ch’an  sitting very helpful as rest or relief. So even for no greater purpose, this  Ch’an class has been very useful and should be highly recommended.” [from Ch’an  Magazine Vol.1; No.1] 
In the first lesson of each class, I always ask each of the  students individually his or her purpose in learning Ch’an whether he or she  hoped to benefit the body, or sought help for the mind. The answers show that  the latter were in the majority. This indicates that people living in American  society today, under the strain and pressure of the present environment, suffer  excessive tension, and many have lost their mental balance. Some are so severely  tense that they have to consult a psychiatrist. Among those who come to learn  Ch’an, I have one woman student, an outstanding lecturer in a well-known  university, who asked me at the first meeting if I could help to relieve her  from tense and uneasy moods. I told her that for a Ch’an practitioner this is a  very simple matter. After five lessons she felt that Ch’an was a great blessing  to her life. 
The method of the first stage is very simple. Mainly it  requires you to relax all the muscles and nerves of your entire body, and  concentrate your attention on the method you have just learned. Because the  tension of your muscles and nerves affects the activity of the brain, the key is  therefore to reduce the burden on your brain. When your wandering thoughts and  illusions decrease, your brain will gradually get a little rest. As its need of  blood is reduced, more blood will circulate through the entire body. Meanwhile,  because of the relaxation of the brain, all the muscles also relax; thus your  blood vessels expand, you feel comfortable all over, your spirit feels fresh and  alert, and your mental responses are naturally lighter and more lively. 
If one’s object of study is just to acquire physical and mental  balance, and not to study meditation proper, then one will probably feel that  the completion of the first stage is enough; but many students are not content  with this, and indeed, some from the outset are looking for the goal of the  second stage. 
Stage 2: From the sense of the small ‘I’
The first stage only helps to bring concentration to your  confused mind; but when you practise concentration, other scattered thoughts  continue to appear in your mind - sometimes many, sometimes a few. The concept  of your purpose in practising Ch’an is for mental and physical benefits. This is  a stage where your concept is purely self-centred. There is no mention of  philosophical ideals or religious experience. When you reach the second stage,  it will enable you to liberate yourself from the narrow view of the ‘I’. In the  second stage you begin to enter the stage of meditation. When you practise the  method of cultivation taught by your teacher, you will enlarge the sphere of the  outlook of the small ‘I’ until it coincides with time and space. The small ‘I’  merges into the entire universe, forming a unity. When you look inward, the  depth is limitless; when you look outward, the breadth is limitless. Since you  have joined and become one with universe, the world of your own body and mind no  longer exists. What exists is the universe, which is infinite in depth and  breadth. You yourself are not only a part of the universe, but also the totality  of it. 
When you achieve this experience in your Ch’an sitting, you  will then understand what is meant in philosophy by principle or basic  substance, and also what phenomenal existence is. All phenomena are the floating  surface or perceptible layer of basic substance. From the shallow point of view,  the phenomena have innumerable distinctions and each has different  characteristics; in reality, the differences between the phenomena do not impair  the totality of basic substance. For instance, on the planet on which we live,  there are countless kinds of animals, plants, minerals, vapours, liquids and  solids which incessantly arise, change and perish, constituting the phenomena of  the earth. However, seen from another planet, the earth is just one body. When  we have the opportunity to free ourselves from the bonds of self or subjective  views, to assume the objective standpoint of the whole and observe all phenomena  together, we can eliminate opposing and contradictory views. Take a tree as an  example. From the standpoint of the individual leaves and branches, they are all  distinct from one another, and can also be perceived to rub against one another.  However, from the standpoint of the trunk and roots, all parts without exception  are of one unified whole. 
In the course of this second stage, you have realised that you  not only have an independent individual existence, but you also have a universal  existence together with this limitlessly deep and wide cosmos, and therefore the  confrontation between you and the surrounding environment exists no more.  Discontent, hatred, love, desire - in other words dispositions of rejecting and  grasping disappear naturally, and you sense a feeling of peace and satisfaction.  Because you have eliminated the selfish small ‘I’, you are able to look upon all  people and all things as if they were phenomena produced from your own  substance, and so you will love all people and all things in the same way you  loved and watched over your small ‘I’. This is the mind of a great philosopher.  
Naturally, all great religious figures must have gone through  the experiences of this second stage, where they free themselves from the  confines of the small ‘I’, and discover that their own basic substance is none  other than the existence of the entire universe, and that there is no difference  between themselves and everything in the universe. All phenomena are  manifestations of their own nature. They have the duty to love and watch over  all things, and also have the right to manage them; just as we have the duty to  love our own children and the right to manage the property that belongs to us  This is the formation of the relationship between the deity and the multitude of  things he created. Such people personify the basic substance of the universe  which they experience through meditation, and create the belief in God. They  substantiate this idea of a large ‘I’ the self-love of God and formulate the  mission of being a saviour of the world or an emissary of God. They unify all  phenomena and look upon them as objects that were created and are to be saved.  Consequently, some religious figures think that the basic nature of their souls  is the same as that of the deity, and that they are human incarnations of the  deity. In this way, they consider themselves to be saviours of the world. Others  think that although the basic nature of their souls is not identical to and  inseparable from that of the deity, the phenomenon of their incarnation shows  that they were sent to this world by God as messengers to promulgate God’s  intention. 
Generally, when philosophers or religious figures reach the  height of the second stage, they feel that their wisdom is unlimited, their  power is infinite, and their lives are eternal. When the scope of the ‘I’  enlarges, self-confidence accordingly gets stronger, but this stronger  self-confidence is in fact merely the unlimited escalation of a sense of  superiority and pride. It is therefore termed large ‘I’, and does not mean that  absolute freedom from vexations has been achieved. 
Stage 3: From the large ‘I’ to no ‘I’
When one reaches the height of the second stage, he realises  that the concept of the ‘I’ does not exist. But he has only abandoned the small  ‘I’ and has not negated the concept of basic substance or the existence of God;  you may call it Truth, the one and only God, the Almighty, the Unchanging  Principle, or even the Buddha of Buddhism. If you think that it is real, then  you are still in the realm of the big ‘I’ and have not left the sphere of  philosophy and religion. 
I must emphasise that the content of Ch’an does not appear  until the third stage. Ch’an is unimaginable. It is neither a concept nor a  feeling. It is impossible to describe it in any terms abstract or concrete.  Though meditation is ordinarily the proper path leading to Ch’an, once you have  arrived at the door of Ch’an, even the method of meditation is rendered useless.  It is like using various means of transportation on a long journey. When you  reach the final destination, you find a steep cliff standing right in front of  you. It is so high you cannot see its top, and so wide that its side cannot be  found. At this time a person who has been to the other side of the cliff comes  to tell you that on the other side lies the world of Ch’an. When you scale it  you will enter Ch’an. And yet, he tells you not to depend on any means of  transportation to fly over, bypass, or penetrate through it, because it is  infinity itself, and there is no way to scale it. 
Even an outstanding Ch’an master able to bring his student to  this place will find himself unable to help any more. Although he has been to  the other side, he cannot take you there with him, just as a mother’s own eating  and drinking cannot take the hunger away from the child who refuses to eat or  drink. At that time, the only help he can give you is to tell you to discard all  your experiences, your knowledge, and all the things and ideas that you think  are the most reliable, most magnificent, and most real, even including your hope  to get to the world of Ch’an. It is as if you were entering a sacred building.  Before you do so, the guard tells you that you must not carry any weapon, that  you must take off all your clothes, and that not only must you be completely  naked you also have to leave your body and soul behind. Then you can enter. 
Because Ch’an is a world where there is no self, if there is  still any attachment at all in your mind, there is no way you can harmonise with  Ch’an. Therefore, Ch’an is the territory of the wise, and the territory of the  brave. Not being wise, one would not believe that after he has abandoned all  attachments another world could appear before him. Not being brave, one would  find it very hard to discard everything he has accumulated in this life - ideals  and knowledge, spiritual and material things. 
You may ask what benefit we would get after making such great  sacrifices to enter the world of Ch’an. Let me tell you that you cannot enter  the world of Ch’an while this question is still with you. Looking for benefit,  either for self or for others, is in the ‘I’-oriented stage. The sixth patriarch  of the Ch’an sect in China taught people that the way to enter the enlightenment  of the realm of Ch’an is: “Neither think of good, nor think of evil”. That is,  you eliminate such opposing views as self and other, inner and outer, being and  non-being, large and small, good and bad, vexation and Bodhi, illusion and  enlightenment, false and true, or suffering of birth and death and joy of  emancipation. Only then can the realm of Ch’an or enlightenment appear and bring  you a new life. 
This new life you have had all along, and yet you have never  discovered it. In the Ch’an sect we call it your original face before you were  born. This is not the small ‘I’ of body and mind, nor the large ‘I’ of the world  and universe. This is absolute freedom, free from the misery of all vexations  and bonds. To enter Ch’an as described above is not easy. Many people have  studied and meditated for decades, and still have never gained entrance to the  door of Ch’an. It will not be difficult, however, when your causes and  conditions are mature, or if you happen to have a good Ch’an master who guides  you with full attention. This Master may adopt various attitudes, actions and  verbal expressions which may seem ridiculous to you, as indirect means of  assisting you to achieve your goal speedily. And when the Master tells you that  you have now entered the gate, you will suddenly realise that there is no gate  to Ch’an. Before entering, you cannot see where the gate is, and after entering  you find the gate non-existent. Otherwise there will be the distinction between  inside and outside, the enlightened and the ignorant; and if there are such  distinctions, then it is still not Ch’an. 
When you are in the second stage, although you feel that the  ‘I’ does not exist, the basic substance of the universe, or the Supreme Truth,  still exists. Although you recognise that all the different phenomena are the  extension of this basic substance or Supreme Truth, yet there still exists the  opposition of basic substance versus external phenomena. Not until the  distinctions of all phenomena disappear, and everything goes back to truth or  Heaven, will you have absolute peace and unity. As long as the world of  phenomena is still active, you cannot do away with conflict, calamity, suffering  and crime. Therefore, although philosophers and religious figures perceive the  peace of the original substance, they still have no way to get rid of the  confusion of phenomena. 
One who has entered Ch’an does not see basic substance and  phenomena as two things standing in opposition to each other. They cannot even  be illustrated as being the back and palm of a hand. This is because phenomena  themselves are basic substance, and apart from phenomena there is no basic  substance to be found. The reality of basic substance exists right in the  unreality of phenomena, which change ceaselessly and have no constant form. This  is the Truth. When you experience that phenomena are unreal, you will then be  free from the concept of self and other, right and wrong, and free from the  vexations of greed, hatred, worry and pride. You will not need to search for  peace and purity, and you will not need to detest evil vexations and impurity.  Although you live in the world of phenomenal reality, to you, any environment is  a Buddha’s Pure Land. To an unenlightened person, you are but an ordinary  person. To you, all ordinary people are identical with Buddha. You will feel  that your own self-nature is the same as that of all Buddhas, and the  self-nature of Buddhas is universal throughout time and space. You will  spontaneously apply your wisdom and wealth, giving to all sentient beings  everywhere, throughout all time and space. 
What I have said reveals a small part of the feeling of one who  has entered the enlightened realm of Ch’an, and is also the course which one  follows in order to depart from the small ‘I’ and arrive at the stage of no ‘I’.  Nevertheless, a newly enlightened person who has just entered the realm of Ch’an  is still at the starting section of the entire passage of Ch’an. He is like one  who has just had his first sip of port. He knows its taste now, but the wine  will not remain in his mouth forever. The purpose of Ch’an is not just to let  you take one sip, but to have your entire life merge with and dissolve in the  wine, even, to the point that you forget the existence of yourself and the wine.  After tasting the first sip of egolessness, how much farther must one travel?  
What kinds of things remain to be seen? 
I will tell you when I have the chance!
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