To rectify past blunders is impossible, but we might profit by the experience of them.

Sometimes life's so much cooler when you just don't know any better and all the painful lessons have not hammered your head open yet.

You learn from a conglomeration of the incredible past - whatever experience gotten in any way whatsoever.

In this bright future you can't forget your past.

All sciences are vain and full of errors that are not born of Experience, the mother of all Knowledge.

The past is a rich resource on which we can draw in order to make decisions for the future, but it does not dictate our choices. We should look back at the past and select what is good, and leave behind what is bad.