Nothing in the world is weaker than water;

But, for attacking the hard and strong, there is nothing like it!

For nothing can take its place.

That the weak overcomes the strong, and the soft overcomes the hard,

This is something known by all, practiced by none.

From the Tao Te Ching (by Lao Tsu), Chapter Seventy-eight, translated by John C. H. Wu

I also like the edition translated by Gia-Fu Feng and Jane English

(with black and white photos by Jane English)