Memory is shadowy, but sometimes it holds the seeds of new life.
Conscious reflection on the past can deepen the soul and even provide revelations of great value for the present and future. On the other hand, returning to the past obsessively out of emotional addiction can be a massive, massive draining of vitality needed for full engagement with the present. The past is not fixed or irrevocable. Memories are continually revised. Also, occurrences in the present or future can drastically alter the meaning of the past. For example, let's say someone has a life phase of intense alcoholism in their past. In one timeline that phase is consistent with a general downwardly spiraling life path. In another timeline the person learns from that phase and uses the wisdom gained from encountering darkness to counsel others who are similarly afflicted. The meaning of the alcoholic phase is drastically altered based on what comes after, and this is one of the ways in which the past is mutable. Even neurologically, when memories are recalled they are always reinterpreted based on current values and point of view. The memory is an artifact of the past that, like an antique, has a resonance with the past but exists in the present where it can be re-experienced and re-interpreted.
The past is still alive, but like the present or future, how we relate to it determines whether it inspires or entraps us. Consider this a propitious time to heal your relationship to the past.