Never interrupt your enemy when he is making a mistake.
Napoleon Bonaparte
A smart man makes a mistake, learns from it, and never makes that mistake again. But a wise man finds a smart man and learns from him how to avoid the mistake altogether.
Roy H. Williams
Failure is the key to success; each mistake teaches us something.
Morihei Ueshiba
An error doesn’t become a mistake until you refuse to correct it.
Orlando Aloysius Battista