Chapter 3, Part 5B - Lieh Tzu

Accordingly, the experiment was begun. The professor exposed his patient to cold, so that he was forced to beg for clothes; subjected him to hunger, so that he was fain to ask for food; left him in darkness, so that he was obliged to search for light.

Soon, he was able to report progress to the sons of the house, saying gleefully: 'The disease can be checked. But the methods I shall employ have been handed down as a secret in my family, and cannot be made known to the public. All attendants must, therefore, be kept out of the way, and I must be shut up alone with my patient.'

The professor was allowed to have his way, and for the space of seven days no one knew what was going on in the sick man's chamber. Then, one fine morning, the treatment came to an end, and, wonderful to relate, the disease of so many years' standing had entirely disappeared!
~ Lionel Giles translation via Terebess Asia Online ~

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