Chapter 3, Part 3B - Lieh Tzu

Now, Mr Yin's mind was full of worldly cares, and he was always thinking with anxious solicitude about the affairs of his estate. Thus he was wearing out mind and body alike, and at night he also used to fall asleep utterly exhausted.

Every night he dreamt that he was another man's servant, running about on menial business; of every description, and subjected to every possible kind of abuse and ill-treatment. He would mutter and groan in his sleep, and obtained no relief until morning came.

This state of things at last resulted in a serious illness, and Mr Yin besought the advice of a friend. 'Your station in life,' his friend said, 'is a distinguished one, and you have wealth and property in abundance. In these respects you are far above the average. If at night you dream that you are a servant and exchange ease for affliction, that is only the proper balance in human destiny. What you want is that your dreams should be as pleasant as your waking moments. But that is beyond your power to compass.'

On hearing what his friend said, Mr Yin lightened his servant's toil, and allowed his own mental worry to abate; whereupon his malady began to decrease in proportion.
~ Lionel Giles translation via Terebess Asia Online ~

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