@ what the Buddha taught
Saṃyutta Nikāya
Mahāvaggo
Ānāpānasaṃyuttaṃ
Ekadhammavaggo
Ekadhammasuttaṃ
SN54.1
Situated at Sāvatthi.
OK, there ... said this:
'One principle, almsmen, when cultivated, when made a lot of, is great of fruit, great of benefit. Which one principle?
Recollection on the in and out breathe.
And from cultivated how, almsmen, from made a lot of how, is the recollection on the in and out breathe great of fruit, great of benefit?
Here, almsmen, an almsman gone to a forest or gone to the root of a tree, or gone to an empty home, having folded a seat he sits down, directing the body straight, peripherally attending the recollection.
He either recollected breathes in, or recollected breathes out.
Either while breathing in long he knows: 'long I breathe in',
or while breathing out long he knows: 'long I breathe out'.
Either while breathing in short he knows: 'short I breathe in',
or while breathing out short he knows: 'short I breathe out'.
'While experiencing the whole body I shall breathe in' he trains himself,
'while experiencing the whole body I shall breathe out' he trains himself.
'While relaxing the inclinations for the body I shall breathe in' he trains himself,
'while relaxing the inclinations for the body I shall breathe out' he trains himself.
'While experiencing pleasantness I breathe in' he trains himself,
'while experiencing pleasantness I breathe out' he trains himself.
'While experiencing happiness I breathe in' he trains himself,
'while experiencing happiness I breathe out' he trains himself.
'While experiencing the inclinations for the mind I breathe in' he trains himself,
'while experiencing the inclinations for the mind I breathe out' he trains himself.
'While relaxing the inclinations for the mind I breathe in' he trains himself,
'while relaxing the inclinations for the mind I breathe out' he trains himself.
'While experiencing the mind I breathe in' he trains himself,
'while experiencing the mind I breathe out' he trains himself.
'While settling the mind I breathe in' he trains himself,
'while settling the mind I breathe out' he trains himself.
'While emancipating the mind I breathe in' he trains himself,
'while emancipating the mind I breathe out' he trains himself.
'While looking at unstableness I breathe in' he trains himself,
'while looking at unstableness I breathe out' he trains himself.
'While looking at fading I breathe in' he trains himself,
'while looking at fading I breathe out' he trains himself.
'While looking at cessation I breathe in' he trains himself,
'while looking at cessation I breathe out' he trains himself.
'While looking at relinquishment I breathe in' he trains himself,
'while looking at relinquishment I breathe out' he trains himself.
OK when cultivated so, almsmen, when made a lot of so the recollection on the in and out breathe is great of fruit, great of benefit.'