Adi Shankara

“ In the net of imaginings of things not Self, the image of the Self is held back; by resting on the eternal Self, their destruction comes, and the Self shines clear.
As the mind rests more and more on the Self behind it, it is more and more freed from outward imaginings; when imaginings are put away, and no residue left, he enters and becomes the Self, pure of all bonds. ”

“ The beholder of every change in things that change, can be the unchanging alone; in the mind's desires, in dreams, in dreamless sleep the insubstantial nature of things that change is clearly perceived again and again.
Therefore put away the false selfhood of this fleshly body, for the false selfhood of the body is built up by thought; knowing the Self as thine own, unhurt by the three times, undivided illumination, enter into peace. ”

“ While there yet lingers a residue undissolved of the thought that this body is the Self, carefully seeking union with the Self, make an end of transferring selfhood to things not Self.
As long as the thought of separate life and the world shines, dreamlike even, so long incessantly, O wise one, make an end of transferring selfhood to things not Self.
The body of desire, born of father and mother of impure elements, made up of fleshly things impure, is to be abandoned as one abandons an impure man afar; gain thy end by becoming the Eternal. ”