Saññāsuttaṃ [SN 18.6, PTS 2.247]

6.

The Discourse on Perception

193. He was dwelling at Sāvatthī, etc. "What do you think, Rāhula, is perception of material form permanent or impermanent?" "Impermanent, venerable sir." Etc. "Perception of sound... etc. Perception of odour... Perception of flavour... Perception of tangible object... Is perception of mental phenomena permanent or impermanent?" "Impermanent, venerable sir." Etc. "Seeing thus, Rāhula, a learned noble disciple becomes disenchanted with perception of material form, etc. He becomes disenchanted with perception of sound... He becomes disenchanted with perception of odour... He becomes disenchanted with perception of flavour... He becomes disenchanted with perception of tangible object... He becomes disenchanted with perception of mental phenomena, etc. he understands." The sixth.