to look back at a time and not see anything you did wrong means that you haven’t learned anything

This is one conclusion. Or... you might have forgotten that time, so you remember it, but can't precisely recall your ideas or thoughts from back then. This is why I document my ideas as much as I can. This website is one way (through posts and comments), but a personal space is better to record more personal/absurd ideas that you don't share with others.