Confucius saw an old man swimming at the Lüliang waterfall — the current violent enough to drown fish and turtles. He sent a disciple to help. But the man came out singing. 'How do you do it?' Confucius asked. 'I go under with the whirls and come up with the eddies,' said the man. 'I follow along with the way of the water and do not impose my own selfish wishes upon it. This is how I stay afloat.'

Chuang Tzu, Chapter 19 – Mastering Life