Quotation by Chuang Tse:
Those whom heaven helps we call the sons of heaven. They do not learn this by learning. They do not work it by working. They do not reason it by using reason. To let understanding stop at what cannot be understood is a high attainment. Those who cannot do it will be destroyed on the lathe of heaven.
Context Details: Quotation at the beginning of Chapter 3 of The Lathe of Heaven, by Ursula K. LeGuin.