Do you ever beat yourself up emotionally about something you did or didn't do? Maybe your performance wasn't up to your expectations. Maybe someone else was unhappy with what you did. For me, that's hard to let go, and yet holding onto it is virtually useless. It's better to let it go, so that I can pick up something else and get working.
Work hard. Learn. Move on.
Do your best and forgive the rest.
-- doug smith