Tao Te Ching: Chapter 4

The Tao is empty but fills everything.

Bottomless source of all beings.

Edgeless and unconvoluted, shining with modesty, quite at home in the dust.

Hard to see but impossible to miss.

What could it be made of?

It is here before everything else.

Our efforts are efforts that bring about effortlessness, our doings the doings that lead to non-doing.