Dwelling in the past prevents doing something in the present.
Do not let what you cannot do interfere with what you can do.
I've never stopped trying to do what's right. I'm not doing it to earn favor with God. I'm doing it because it's the right thing to do.
You have not taught until they have learned.
Discipline yourself, and others won't need to.
It is harmful to compare yourself to others. Others will do that for you.