Acharya Prashant explains that everything visible and grand is subject to time, having been created by it and destined to be destroyed by it. He emphasizes that the true self exists beyond time, citing Shri Jesus's statement that he existed before Abraham and that the kingdom of God is a place where time does not exist. The speaker asserts that one cannot truly know themselves because the observer cannot be the observed; anything that can be known—such as the body, thoughts, or feelings—is not the true self. Therefore, answering the question 'Who am I?' is an impossibility for the mind, as the mind can only identify what it is not.