By Maharishi Mahesh Yogi.
Question: Why don’t we remember our former incarnations?
Maharishi: “It is the blessing of God that we forget the miserable past - it is the blessing of God that we forget the past. If we know the miserable past - and the past is lesser developed - if in the present more developed state of our consciousness, we are overshadowed by the influence of the lesser developed states of the past, then we will be more miserable and less advanced, evolution will stop." Hochgurgl, 1962