This Atman is self-evident. This Atman or Self is not established in by proofs of existence of the Self. It is not possible to deny this Atman, for it is the very essence of he who denies it. The Atman is the basis of all kinds of knowledge. The Self is within, the Self is without, the Self is before and the Self is behind. The Self is on the right hand, the Self is on the left, the Self is above and the Self is below.