When one realizes the witness(soul) and witnessed(mind or universe) are one in essence than the wisdom dawns.

Nothing can be independent of consciousness,  because no second thing exists other than consciousness.   Consciousness is cause of everything that exists as illusion but it itself is uncaused. The whole universe  with or without the form, time and space is consciousness.  Without the form, time and space there is no universe but it is only the objectless consciousness. But this truth has to be grasped to assimilate and realize the true essence of non-dualistic or Advaitic reality.  

When one puts aside the imagination and has the thinker-- what does he get with thinking—he can get only a thought. Meditation is only an effort of the waking entity or ego within the  waking or illusion; it is imagination based on the waking entity or  false self; the consciousness remaining the same with or without waking experience or universe.

When formless soul , the innermost self , witnesses   the waking experience and its attention is fixed to the waking waking entity and waking world , which is an object to it, than it is in ignorance of its formless non-dual true nature . when soul, the innermost self  is in ignorance and it is in forgetfulness of its own formless non-dual true nature. 

Same thing is applied to the dream. But when formless witness is free from waking and dream it is in its formless non-dual true nature, which identified as deep sleep in the waking experience, which is also  the state of ignorance.   Until waking entity traces the formless witness mentally and realizes it itself is not the self but the self is the  formless soul ,which  witnesses the coming and going of the three states.  When one realizes  the witness(soul)  and witnessed(mind or universe)  are one in essence  than  the wisdom dawns.