[274] And how, bhikkhus, does a bhikkhu abide contemplating the body in the body (kāyānupassanā)? Here, bhikkhus, a bhikkhu, gone to the forest, or gone to the root of a tree, or gone to an empty dwelling, sits down, having folded his legs crosswise, having set his body erect, having established mindfulness (sati) in front of him. Mindful, he breathes in; mindful, he breathes out. Breathing in long, he knows clearly, 'I breathe in long'; or breathing out long, he knows clearly, 'I breathe out long.' Breathing in short, he knows clearly, 'I breathe in short'; or breathing out short, he knows clearly, 'I breathe out short.' He trains thus: 'Experiencing the whole body, I shall breathe in'; he trains thus: 'Experiencing the whole body, I shall breathe out.' He trains thus: 'Calming the bodily formation (kāyasaṅkhāra), I shall breathe in'; he trains thus: 'Calming the bodily formation, I shall breathe out.'
Just as, bhikkhus, a skilled turner or a turner's apprentice, when making a long pull, knows clearly, 'I make a long pull'; or when making a short pull, knows clearly, 'I make a short pull'—even so, bhikkhus, a bhikkhu, breathing in long, knows clearly, 'I breathe in long'; or breathing out long, knows clearly, 'I breathe out long.' Breathing in short, he knows clearly, 'I breathe in short'; or breathing out short, he knows clearly, 'I breathe out short.' He trains thus: 'Experiencing the whole body, I shall breathe in'; he trains thus: 'Experiencing the whole body, I shall breathe out.' He trains thus: 'Calming the bodily formation, I shall breathe in'; he trains thus: 'Calming the bodily formation, I shall breathe out.'
Thus he abides contemplating the body in the body internally, or he abides contemplating the body in the body externally, or he abides contemplating the body in the body both internally and externally. Or he abides contemplating in the body its nature of origination (samudaya), or he abides contemplating in the body its nature of vanishing, or he abides contemplating in the body its nature of both origination and vanishing. Or else his mindfulness that 'there is a body' is established, merely to the extent of knowledge (ñāṇa), merely to the extent of continued mindfulness. And he abides independent, and does not cling to anything in the world. Thus too, bhikkhus, a bhikkhu abides contemplating the body in the body.
The Section on Mindfulness of Breathing (ānāpānasati) is concluded.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.