We know that the water principle is every bit as elemental as rock, and that its nature is stronger than rock in the sense that water wears down rock. Water also has the enchanting quality of receptivity. It parts to allow anything in, then resumes itself. If you hit a mountain or a rock with a hammer, in spite of its hardness, or actually because of it, the rock chips, fragments, breaks apart. But if you hit the ocean or a pond with a hammer, all you get is a rusty hammer. A key virtue of water power reveals itself in this.