Tao Te Ching Chapter 5
Nature is unkind:
It treats the creation like sacrificial straw-dogs.
The Sage is unkind:
He treats the people like sacrificial straw-dogs.
How the universe is like a bellows!
Empty, yet it gives a supply that never fails;
The more it is worked, the more it brings forth.
By many words is wit exhausted.
Rather, therefore, hold to the core.