The crane masterfully combines vigilance and movement. Those are exactly the qualities we need to go through life and to follow Tao. Vigilance is hard to get right. All too often we confuse vigilance with passivity — we are willing to wait and look, but we forget to act. Vigilance is not a matter of mere waiting. It is a matter of the correct timing. It takes an exquisite sense of proportion to know that we are not just standing still — we are moving no faster and no slower than required by the situation.
— Deng Ming-Dao, Everyday Tao