[183] On one occasion the Venerable Sāriputta was dwelling at Sāvatthī, in Jeta's Grove, Anāthapiṇḍika's park. Then a certain bhikkhu approached the Venerable Sāriputta; having approached, he exchanged greetings with the Venerable Sāriputta, and when the courteous and cordial talk was concluded, he sat down to one side. Sitting to one side, that bhikkhu said this to the Venerable Sāriputta: "Friend Sāriputta, a bhikkhu who was your co-resident pupil (saddhivihārika) has renounced the training and returned to the lower life."
"So it is, friend, for one whose doors are unguarded in the sense faculties (indriya), who is immoderate in eating, and who is not devoted to wakefulness (jāgariya). Truly, friend, that a bhikkhu whose doors are unguarded in the sense faculties, who is immoderate in eating, and who is not devoted to wakefulness should maintain the holy life (brahmacariya) complete and pure for as long as life lasts — this is not possible. Truly, friend, that a bhikkhu whose doors are guarded in the sense faculties, who is moderate in eating, and who is devoted to wakefulness should maintain the holy life complete and pure for as long as life lasts — this is possible."
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.