At Sāvatthī.

“What do you think, Rāhula? Is craving for sights permanent or impermanent?”

“Impermanent, sir.” …

“… craving for sounds … craving for smells … craving for tastes … craving for touches … Is craving for thoughts permanent or impermanent?”

“Impermanent, sir.” …

“Seeing this, a learned noble disciple grows disillusioned with craving for sights, sounds, smells, tastes, touches, and thoughts. …”