Daoism

“By letting go it all gets done. The world is won by those who let it go. But when you try and try, the world is beyond winning.”
— Lao Tzu, Tao Te Ching

Stoicism

“Do not act as if you were going to live ten thousand years. Death hangs over you. While you live, while it is in your power, be good.”
— Marcus Aurelius, Meditations