Nothing in the world is softer or more yielding than water. But, for wearing down the hard and strong, there is nothing like it. That yielding overcomes the strong and softness overcomes the hard is something that is known by all, but is practiced by few.
Tao Teh Ching, 78. Translation by Hua-Ching Ni.
How does the sea become the queen of all rivers and streams? By lying lower than they do! Hence, it is the queen of all rivers and streams. Tao Teh Ching, 66. Translation by Hua-Ching Ni.