UNIFIED MIND
When your discriminating mind diminishes, your narrow sense of self diminishes as well. Your field of awareness—which is at first the totality of the body—naturally opens up to include the external environment. Inside and outside become one. In the beginning, you may still notice that a sound is coming from a certain direction or that your mind follows distinct events within the environment, such as someone moving. But as you continue, these distinctions fade. You are aware of events around you, but they do not leave traces. You no longer feel that the environment is out there and you are in here. The environment poses no opposition or burden. It just is. If you are sitting, then the environment is you, sitting. If you have left your seat and are walking about, then the environment is still you, in all of your actions. This experience, the second stage of silent illumination, is called the oneness of self and others.
Can you still hear sounds? Yes. Can you get up to have a drink of water or urinate? Of course. Is there mentation? Yes. You have thoughts as you need them to respond to the world, but they are not self-referential. Compassion naturally arises when it is needed; it has nothing to do with emotion. There is an intimacy with everything around you that is beyond words and descriptions. When you urinate, the body, urine, and toilet are not separate. Indeed, you all have a wonderful dialogue!
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There are progressively deeper states of this second stage. When you enter a state in which the environment is you sitting, the environment may become infinite and boundless, bringing about a state of oneness with the universe. The whole world is your body sitting there. Time passes quickly and space is limitless. You are not caught up in the particulars of the environment. There is just openness of mind, clarity, and a sense of the infinite. This is not yet the realization of no-self; it is the experience of great self.
At this point, three subtler experiences may occur, all related to the sense of great self. The first is infinite light. The light is you, and you experience a sense of oneness, infinity, and clarity.
The second experience is infinite sound. This is not the sound of cars, dogs, or something similar. Nor is it like music or anything else you have ever heard. It is a primordial, elemental sound that is one with the experience of vastness. It is harmonious in all places, without reference or attribution.
The third experience is voidness. But this is not the emptiness of self-nature or of no-self that would constitute enlightenment. This is a spacious voidness in which there is nothing but the pure vastness of space. Although you do not experience a sense of self, a subtle form of self and object still exists.
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NO-SELF, NO-MIND
The clarity of the second stage is like looking through a spotless window. You can see through it very well, almost as if the window were not there, but it is there. In the second stage, the self lies dormant but subtle self-grasping is present. In other words, seeing through a window, even a very clean one, is not the same as seeing through no window at all. Seeing through no window is one way of describing the state of enlightenment, which is the third stage. In utter clarity, the mind is unmoving. Why? Because there is no self-referential mind.
http://www.lionsroar.com/you-are-already-enlightened/