Chapter 11, Part 3A - Chuang Tzu

Ts'ui Chu was questioning Lao Tan. "If you do not govern the world, then how can you improve men's minds?"

Lao Tan said, "Be careful - don't meddle with men's minds! Men's minds can be forced down or boosted up, but this downing and upping imprisons and brings death to the mind. Gentle and shy, the mind can bend the hard and strong; it can chisel and cut away, carve and polish. Its heat is that of burning fire, its coldness that of solid ice, its swiftness such that, in the time it takes to lift and lower the head, it has twice swept over the four seas and beyond. At rest, it is deep-fathomed and still; in movement, it is far-flung as the heavens, racing and galloping out of reach of all bonds. This indeed is the mind of man!"

In ancient times the Yellow Emperor first used benevolence and righteousness to meddle with the minds of men. Yao and Shun followed him and worked till there was no more down on their thighs, no more hair on their shins, trying to nourish the bodies of the men of the world. They grieved their five vital organs in the practice of benevolence and righteousness, taxed their blood and breath in the establishment of laws and standards. But still some men would not submit to their rule, and so they had to exile Huan Tou to Mount Ch'ung, drive away the San-miao tribes to the region of San-wei, and banish Kung to the Dark City. This shows that they could not make the world submit.
~ Burton Watson translation via Terebess Asia Online ~

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