Shundo David Haye

‘A non-Buddhist philosopher said to the Buddha, “I do not ask for words; I do not ask for non-words.” The Buddha just sat there. The philospher said admiringly, “The World-honored One, with his great mercy, has blown away the clouds of my illusion and enabled me to enter the Way.” And after making bows, he took his leave.

Then Ananda asked the Buddha, “What did he realize, to admire you so much?” The World-honored One replied, “A fine horse runs at the shadow of the whip.” (Mumonkan, case 32)

Of course, when the Buddha tries the not-speaking trick, it works much better…