Acharya Prashant explains the teachings of Adi Shankaracharya from the text Aparoksha Anubhuti, focusing on the flow of the self-like and the rejection of the non-self. He clarifies that one's true nature is the eternal Soul or Truth. Wisdom lies in allowing this true nature to flow and express itself while disregarding everything that is transient, illusory, or limited. Thoughts, emotions, and impulses are 'non-self' because they come and go, whereas the true Self has no beginning or end. Anything that is born, named, or mortal is unworthy of being identified as the 'I' or the Soul and should be neglected.