At Sāvatthī. “What do you think, Rāhula? Is perception of sights permanent or impermanent?” “Impermanent, sir.” … “… perception of sounds … perception of smells … perception of tastes … perception of touches … Is perception of ideas permanent or impermanent?” “Impermanent, sir.” … “Seeing this, a learned noble disciple grows disillusioned with the perception of sights, sounds, smells, tastes, touches, and ideas. …”