Ralph Waldo Emerson, letter to his daughter 1854

Finish every day and be done with it. For manners and for wise living it is a vice to remember. You have done what you could; some blunders and absurdities no doubt crept in; forget them as soon as you can. To-morrow is a new day; you shall begin it well and serenely, and with too high a spirit to be cumbered with your old nonsense.