You don’t have to have a past at all. Being born again each morning, as you open your eyes, is a well-known spiritual technique that promises inner peace and a lot of times it delivers. It’s not easy work though.
We may be a bunch of inconsistent creatures, fortunately we have some landmarks, and the final threshold stands out as a reassuring barrier. Most people prefer not to think of it. In my opinion a daily dose of remembering this last barrier exists as a necessary antidote to existential confusion.