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. This day for all that is good and fair. It is too dear, with its hopes and invitations, to waste a moment on the rotten yesterdays.
Ralph Waldo Emerson, in James Elliot Cabot’s A Memoir of Ralph Waldo Emerson, Volume 2