If you're not making mistakes, then you're not doing anything. I'm positive that a doer makes mistakes.
-- John Wooden
You build on failure. You use it as a stepping stone. Close the door on the past. You don't try to forget the mistakes, but you don't dwell on it. You don't let it have any of your energy, or any of your time, or any of your space.
-- Johnny Cash
Success seems to be connected with action. Successful people keep moving. They make mistakes, but they don't quit.
-- Conrad Hilton
“Finish each day and be done with it. You have done what you could. Some blunders and absurdities no doubt crept in; forget them as soon as you can. Tomorrow is a new day. You shall begin it serenely and with too high a spirit to be encumbered with your old nonsense.” ― Ralph Waldo Emerson