The Master's power is like this. He lets all things come and go effortlessly, without desire. He never expects results; thus he is never disappointed. He is never disappointed; thus his spirit never grows old.
Seal the openings, shut the doors, and until your last day you will not be exhausted. Widen the openings, interfere, and until your last day you will not be safe.
It (Tao) is eternally without desire. So, it can be called small. All things return to it, although it does not make itself their ruler. So, it can be called great.