Finish every 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

In the realm of Nature, there is nothing purposeless, trivial, or unnecessary.

Maimonedes, The Guide for the Perplexed

But what is happiness except the simple harmony between a man and the life he leads?

Albert Camus