If you know your mistakes and can correct them, there is no greater good.

It is never too late to correct your mistakes. (Shakespeare)

It is not too late to remedy the situation before it is too late.

A person cannot trip over the same stone twice.

Smart people will correct their mistakes when they know they are wrong, and stupid people will hide their mistakes when they are wrong.

No one is perfect, everyone will make mistakes, as long as they correct themselves, everything will be good.