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:

“Mendicants, before my awakening—when I was still unawakened but intent on awakening—I thought: ‘Why don’t I meditate by continually dividing my thoughts into two classes?’ So I assigned sensual, malicious, and cruel thoughts to one class. And I assigned thoughts of renunciation, good will, and harmlessness to the second class.