We are the same person we were when we were eleven years old. Yet all our cells have completely changed, grown, and renewed themselves to take us from childhood into adulthood and old age. Actually, nothing is left from when we were eleven except our Eternal Souls.
We can gain wisdom from our past. Wisdom is one of the goals of Philosophy. But this is wisdom from just this lifetime. It doesn’t take past life patterns into account. So which life are we talking about when we talk about our past?
On an even deeper level, the past really does not exist. Can you put your hands on it? So many of our memories may be colored by what other people have told us. The present moment is, literally all we have to live in. Obviously we cannot live in the future, which has not arrived yet.
Furthermore, our minds are fallible and easily forget things. We forget the majority of the moments we have lived. How many people remember the name of their Kindergarten teachers? Do you remember what you had for lunch three years ago on Thursday? Therefore, apart from practical wisdom so we can avoid mistake we already made, and a few delightful memories that are fun to revisit, our pasts are not important.