A new post by Kyle Dixon/Krodha: https://www.reddit.com/r/Buddhism/comments/18tia6k/comment/kfe8y12/?utm_source=reddit&utm_medium=web2x&context=3 

krodha

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4 days ago

Nonduality has a few iterations in buddhadharma.

The two main versions I would say are that phenomena are “nondual” because being ultimately empty, they are free from the dual extremes of existence and nonexistence. That is one of the primary definitions of emptiness, freedom from those extremes.

The Kaumudī states:

Because of the absence of inherent existence, the nondual essence of all phenomena is emptiness.

Bhāviveka describes the yogic direct perception of emptiness in his Tarkajvālā:

When that yogin dwells in the experience of nonconceptual discerning wisdom [prajñā] and experiences nonduality, at that time, ultimately, the entire reality of objects are as follows, of the same characteristics, like space, appearing in the manner of a nonappearance since their characteristics are nonexistent.

Another type of nonduality, which is arguably implied in the previous type, is the collapse of subject and object which involves the function of seeing and appearances that are seen, occurring as one single movement so-to-speak. Also with hearing, the activity of hearing is realized to be sound itself. It is not that something is being heard, the sound is precisely hearing, which is precisely consciousness. The Buddha describes this in the Kalakarama sutta, for example.

This experience is obstructed by a type of knowledge obscuration in normal sentient beings, one must actually awaken to taste, or experience this. Even if we stop conceptualizing and rest in bare awareness, there is still a cognitive bifurcation that is in place. That dualistic consciousness only subsides in awakened equipoise.

Jamgon Mipham Rinpoche:

Then, at the time of the supreme quality on the path of joining, one realizes that since the perceived does not exist, neither does the perceiver. Right after this, the truth of suchness, which is free from dualistic fixation, is directly realized. This is said to be the attainment of the first bhūmi.