Chapter 33, Part 5A - Chuang Tzu

To regard the source as pure and the things that emerge from it as coarse, to look upon accumulation as insufficiency; dwelling alone, peaceful and placid, in spiritual brightness there were those in ancient times who believed that the "art of the Way" lay in these things.

The Barrier Keeper Yin and Lao Tan heard of their views and delighted in them. They expounded them in terms of constant nonbeing and being, and headed their doctrine with the concept of the Great Unity. Gentle weakness and humble self-effacement are its outer marks; emptiness, void, and the noninjury of the ten thousand things are its essence.

The Barrier Keeper Yin said, "When a man does not dwell in self, then things will of themselves reveal their forms to him. His movement is like that of water, his stillness like that of a mirror, his responses like those of an echo. Blank-eyed, he seems to be lost; motionless, he has the limpidity of water. Because he is one with it, he achieves harmony; should he reach out for it, he would lose it. Never does he go ahead of other men, but always follows in their wake."
~ Burton Watson translation via Terebess Asia Online ~

Go here to read the introductory post to the chapters of the Book of Chuang Tzu.