Bāhirāniccātītānāgata Sutta [SN 35.10, PTS 4.5]

10.

The Discourse on the External as Impermanent in the Past and Future

10. "Visible forms, monks, are impermanent, whether past or future; what then to say of the present! Seeing thus, monks, a learned noble disciple is without longing for past forms; he does not delight in future forms; he is practising for disenchantment, dispassion, and cessation of present forms. Sounds... Odours... Flavours... Tangibles... Mental phenomena are impermanent, whether past or future; what then to say of the present! Seeing thus, monks, a learned noble disciple is without longing for past mental phenomena; he does not delight in future mental phenomena; he is practising for disenchantment, dispassion, and cessation of present mental phenomena." The tenth.