I love this quote by Ralph Waldo Emerson. So much so, that we have it printed on a card for everyone who walks into our offices to take and keep close at hand.
I think we can all use this reminder:
“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; begin it well and serenely and with too high a spirit to be encumbered with your old nonsense.”