Chapter 24, Part 15B - Chuang Tzu

End with what is Heavenly, follow what is bright, hide in what is pivotal, begin in what is objective - then your com­prehension will seem like noncomprehension, your understanding will seem like no understanding; not understanding it, you will later understand it. Your questions about it cannot have a limit, and yet they cannot not have a limit.

Vague and slippery, there is yet some reality there. Past and present, it does not alter - nothing can do it injury. We may say that there is one great goal, may we not? Why not inquire about it? Why act in such perplexity? If we use the unperplexed to dispel perplexity and return to unperplexity, this will be the greatest unperplexity.
~ Burton Watson translation via Terebess Asia Online ~

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