The past lives in you as memories, but memories in themselves are not a problem. In fact, it is through memory that we learn from the past and from past mistakes. It is only when memories, that is to say, thoughts about the past, take you over completely that they turn into a burden, turn problematic, and become part of your sense of self. Your personality, which is conditioned by the past, then becomes your prison.
— Eckhart Tolle