Tomorrow is a New Day

"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, with too high a spirit to be encumbered with your old nonsense.
This day is all that is good and fair. It is too dear, with its hopes and invitations, to waste a moment on yesterdays." 

Ralph Waldo Emerson