Tao Te Ching 45

Who thinks his great achievements poor,
Shall find his vigor long endure.
Of greatest fullness, deemed a void,
Exhaustion never shall stem the tide.
Do you what's straight still crooked deem;
Your greatest art still stupid seem,
And eloquence a stammering scream.

Constant action overcomes cold; being still overcomes heat. Purity and stillness give the correct law to all under heaven.