Chapter 25, Part 3B - Chuang Tzu

T’ang got hold of the groom and guardsman Teng Heng and had him be his tutor. He followed him and treated him as a teacher, but was not confined by him - so he could follow along to completion, becoming as a result a mere holder of titles. This is called making yourself superfluous, a method by which two manifestations can be attained.

Confucius' injunc­tion "Be done with schemes!"- you could let that be your tutor as well. Or Mr. Yung-ch'eng's saying, "Be done with days and there will be no more years! No inside, no outside."
~ Burton Watson translation via Terebess Asia Online ~

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