"Ask yourself: "Who am I?" Invariably the internal answer will be autobiographical - an identity based on the past. It will be a description of a continuity from childhood through adolescence to adulthood which is all past memories and no longer exists. Memory is the mirror and we live on the wrong side. Seldom will anyone answer the question of "Who am I?" with: "I appear to be the process of reading this page."- Yatri, Unknown Man (via Whiskey River)
I think this quotation expresses the harm in overly associating our past lives with our present ones. Though the past is not meaningless (after all, it has brought us to our current state), too much association with what was prevents the present from really existing. Each day brings so much possibility that we should not allow to be threatened by past negative outcomes.