In Zen master Hakuin's group there was a crazy monk who thought he had realized the identity of self and Buddha. He tore up Buddhist scriptures and used the pages for toilet paper.

Other monks took him to task for this, but he paid no attention, haughtily retorting, "What's wrong with using Buddhist scriptures to wipe a Buddha's ass?"

Now someone repeated this to the master Hakuin, who asked the crazy monk, "They say you are using Buddhist scriptures for toilet paper. Is that so?"

The crazy monk said, "Yes. I myself am a Buddha. What is wrong with using Buddhist scriptures to wipe a Buddha's ass?"

Hakuin said, "You're wrong. Since it's a Buddha's ass, why use old paper with writing on it? You should wipe it with clean white paper."

The crazy monk was shamed, and he apologized.