The most important things in the great Tao are the words: action through non-action. Non-action prevents a man from becoming entangled in form and image (materiality). Action in non-action prevents a man from sinking into numbing emptiness and dead nothingness. […]
Therefore it is said: If, when stimulated by external things, one moves, it is the impulse of the being. If, when not stimulated by external things, one moves, it is the movement of heaven. The being that is placed over against heaven can fall and come under the domination of the impulses. The impulses are based upon the fact that there are external things. They are thoughts that go on beyond one’s own position. Then movement leads to movement. But when no idea arises, the right ideas come. That is the true idea. When things are quiet and one is quite firm, and the release of heaven suddenly moves, is this not a movement without purpose? Action through non-action has just this meaning.
The Secret of the Golden Flower