Devotee (D).: Isn't our personality beginningless?
Bhagawan Sri Ramana Maharshi (B).: Find out first whether it exists at all and after you have solved that problem, ask the question. Nammalwar says: "In ignorance, I took the ego to be the Self, but with right knowledge the ego is not and only you remain as the Self". Both the non-dualists and the dualists agree on the necessity for Self-realisation. Attain that first and then raise other questions. Nondualism or dualism cannot be decided on theoretical grounds alone. If the Self is realised, the question will not arise.
Whatever is born must die; whatever is acquired must be lost; but were you born? You are eternally existent. The Self can never be lost.
Source: Teachings of Sri Ramana Maharshi in his own words by Arthur Osborne, Chapter Three