he who excuses himself accuses himself
By apologizing, one admits that they have done something wrong. No, if you apologize to Mom, then she'll know that you were the only who scratched up her car. He who excuses himself accuses himself!
He who excuses himself accuses himself.
Prov. By apologizing for something, you admit that you did it. Maybe I should tell my boss I'm sorry for breaking the copy machine. On the other hand, he who excuses himself accuses himself.