In this higher (or altered) stated of consciousness, one can also convince himself that he used to be King Tut, or Jesus, or that someone is telling him to go and commit a massacre.<quoted text>
That's a result of the ordinary state of consciousness.
From the higher states of consciousness, one can perceive quite a lot of the causal chain leading to previous lives.
Or that he is the chosen one and his father the God is speaking to him.
But also consider schizophrenia and/or psychosis.
All due respect of course.