[1360] Ānanda, on whatever occasion a bhikkhu trains thus: "Experiencing the mind (citta), I shall breathe in"; trains thus: "Experiencing the mind, I shall breathe out"; … "Gladdening the mind …" … "Concentrating the mind …"; trains thus: "Liberating the mind, I shall breathe in"; trains thus: "Liberating the mind, I shall breathe out" — on that occasion, Ānanda, the bhikkhu dwells contemplating the mind in the mind (cittānupassī), ardent, clearly comprehending, possessed of mindfulness, having removed covetousness and grief regarding the world. For what reason? Ānanda, I do not speak of the development of concentration (samādhi) by mindfulness of breathing (ānāpānasati) for one of muddled mindfulness, who lacks clear comprehension. Therefore, Ānanda, on that occasion a bhikkhu dwells contemplating the mind in the mind, ardent, clearly comprehending, possessed of mindfulness, having removed covetousness and grief regarding the world.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.