[467] And what more, bhikkhus, is to be done? You should train thus: 'We will be devoted to wakefulness (jāgariya). During the day, by walking meditation and by sitting, we will purify the mind (citta) of obstructive states (āvaraṇīyā dhammā). In the first watch of the night, by walking meditation and by sitting, we will purify the mind of obstructive states. In the middle watch of the night we will lie down in the lion's posture on the right side, placing one foot upon the other, with mindfulness and clear comprehension, having attended to the perception of rising. In the last watch of the night, having risen, by walking meditation and by sitting, we will purify the mind of obstructive states.' Thus indeed, bhikkhus, should you train. Now, bhikkhus, it may be that you think: 'We are endowed with moral shame (hiri) and fear of wrongdoing (ottappa); our bodily conduct is purified, our verbal conduct is purified, our mental conduct is purified, our livelihood is purified; we are guarded as to the doors of the sense faculties; we know moderation in eating; we are devoted to wakefulness. This much is enough; this much has been done; the goal of the ascetic life (sāmaññattha) has been attained by us; there is nothing more for us to do'—and you might rest content with just that much. I declare to you, bhikkhus, I announce to you, bhikkhus: let not the goal of the ascetic life decline for you who are seekers of the goal of the ascetic life, while there is still more to be done.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.