@augustus Gutei showed his phallus whenever he was asked a question about Zen. A boy attendant began to imitate him in this way. When anyone asked the boy what his master had preached about, the boy would show his phallus.

Gutei heard about the boy's mischief. He seized him and cut off his phallus. The boy cried and ran away. Gutei called and stopped him. When the boy turned his head to Gutei, Gutei showed his own phallus. In that instant the boy was enlightened.