Nobody doubts that he exists, though he may doubt the existence of God. If he finds out the truth about himself and discovers his own source, this is all that is required.
Ramana MaharshiThe state we call realization is simply being oneself, not knowing anything or becoming anything.
Ramana MaharshiRealisation is our nature. It is nothing new to be gained. What is new cannot be eternal. Therefore there is no need for doubting if one would lose or gain the Self.
Ramana Maharshi