The mind rises as from the soul and subsides in to the soul.

There is so not much on Self-knowledge but there is plenty of information on cults, gurus and their film flam, scandals etc. Real Self-knowledge requires that one has to  find out for himself. This also means discovering, exploring, and thinking for oneself. 

Looking for mystical gurus and yogis are not related to finding  the ultimate truth or Brahman, therefore they are real Self Knowledge or Bramha Gnana or Atma Gnana. A vast majority of these spiritual problems disappear as one takes full responsibility for his own "enlightenment"-- free of religion, god glorification, scriptural knowledge, cultural dogma, and burnt out historical traditions. 

On pursuit of truth, everything all summed up in inquiring, analyzing and reasoning on the base of soul as self that is something one try for himself, and find out for himself.
Therefore, once one has that pointer, that direction, there is no need to waste time and effort. If one is interested in the history of gurus/yogis, or if one finds his transcribed talks entertaining or soothing, that is OK. Otherwise, once one becomes aware of the fact that ‘I’ is not the self, but the soul is the true self he will be able to drop all the accumulated dross.

Truth is hidden in everything and everywhere as formless substance and witness of the three states. To be enlightened is to know the formless substance and witness as ultimate truth. The formless substance and witness is the soul, which is in the form of consciousness. The consciousness is the innermost self. The mind is in the form of universe. Universe appears as waking or dream.

The mind rises as from the soul and subsides in to the soul. Thus, the soul is the source the mind [universe or waking]. The three states are mere mirage on the standpoint of the soul, which is the innermost self. The soul, which is in the form of consciousness, is the source and also the formless substance and witness of the mind or universe. Thus the source and the substance and witness of the mind or universe are one in essence. And that essence is consciousness. Realizing the consciousness as the innermost self is self-realization. 

Thus, the true self is neither the waking entity nor the dream entity but self is the formless substance and witness of the three states, which comes and goes in succession. 
The soul is the true self, therefore, there is a need to learn to view and judge and reason the three states, on the base of soul as self, in order to realize the ultimate truth or Brahman. 
Truth is to know the facts of one’s true existence. To know the facts is to know the truth. Most people are unaware of the fact that physical existence(universe or waking) is mere mirage and live in a delusion. Ultimate Truth is the Gateway to freedom from experiencing duality as reality, therefore there is a need to find the fact that the soul is the self, and soul is the ultimate reality. One has to remember that, and there is no Truth without soul.--FORMLESS PATH