Three Stages of Silent Illumination
The practice of silent illumination taught by Master Sheng Yen can roughly be divided into three stages: concentrated mind, unified mind, and no-mind. Within each stage are infinite depths. You need not go through all the stages, nor are they necessarily sequential.
... [Stage] 2.) 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. ...
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. [JUNDO NOTE: This is teaching of a version of the higher Jhana concentration states that Sheng Yen is mixing into Silent Illumination here.]
These progressively deeper states are all related to samadhi states. When you emerge from them, you must try not to think about them anymore because they are quite alluring. Say to yourself, “This state is ordinary; it’s not it.” Otherwise, it will lead to another form of attachment. ...
[Stage] 3.) No-Self, No-Mind
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The third stage of silent illumination is the realization of quiescence and wakefulness, stillness and awareness, samadhi and prajna, all of which are different ways to describe mind’s natural state. Experiencing it for the first time is like suddenly dropping a thousand pounds from your shoulders—the heavy burdens of self-attachment, vexations, and habitual tendencies. Prior to that, you may not know exactly what self-attachment or vexations are. But once you are free from them, you clearly recognize them.
Self-attachment, vexations, and habitual tendencies run deep. So practitioners must work hard to experience enlightenment again and again until they can simply rest in mind’s natural state. The key is to practice diligently but seek no results.
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Originally Posted by shikantazen
Something is wrong. But if you need to see a doctor, accept that fact. Feel equanimity about it. 
