[This chapter is supplementary to chapter vi.] When Knowledge travelled north, across the Black Water, and over the Dark-Steep Mountain, he met Do-nothing Say-nothing and asked of him as follows:— "Kindly tell me by what thoughts, by what cogitations, may Tao be known? By resting in what, by according in what, may Tao be approached? By following what, by pursuing what, may Tao be attained?" To these three questions, Do-nothing Say-nothing returned no answer. Not that he would not answer, but that he could not. So when Knowledge got no reply, he turned round and went off to the south of the White Water and up the Ku-chüeh Mountain, where he saw All-in-extremes, and to him he put the same questions. "Ha!" cried All-in-extremes, "I know. I will tell you...." But just as he was about to speak he forgot what he wanted to say. So when Knowledge got no reply, he went back to the palace and asked the Yellow Emperor. The latter said, "By no thoughts, by no cogitations, Tao may be known. By resting in nothing, by according in nothing, Tao may be approached. By following nothing, by pursuing nothing, Tao may be attained." Then Knowledge said to the Yellow Emperor, "Now you and I know this, but those two know it not. Who is right?" "Of those two," replied the Yellow Emperor, "Do-nothing Say-nothing is genuinely right, and All-in-extremes is near. You and I are wholly wrong. Those who understand it do not speak about it, those who speak about it do not understand it. Therefore the Sage teaches a doctrine which does not find expression in words. Tao cannot be made to come. Virtue cannot be reached.

He who knows (the Tao) does not (care to) speak (about it); he who is (ever ready to) speak about it does not know it. He (who knows it) will keep...

He who stands on his tiptoes does not stand firm; he who stretches his legs does not walk (easily). (So), he who displays himself does not shine; he...