So I have heard. At one time the Buddha was staying near Sāvatthī in Jeta’s Grove, Anāthapiṇḍika’s monastery. There the Buddha addressed the mendicants, “Mendicants!” “Venerable sir,” they replied. The Buddha said this:

“These are the three characteristics, signs, and manifestations of a fool. What three? A fool thinks poorly, speaks poorly, and acts poorly. If a fool didn’t think poorly, speak poorly, and act poorly, then how would the astute know of them, ‘This worthy one is a fool, an untrue person’? But since a fool does think poorly, speak poorly, and act poorly, then the astute do know of them, ‘This worthy one is a fool, an untrue person’.

A fool experiences three kinds of suffering and sadness in this very life.