SN54.1 — Ekadhammasutta
Originating in Sāvatthi.
There the Blessed One said, Disciples, when one thing is developed and cultivated, it is of great fruit and great benefit.
What is that one thing?
Mindfulness of breathing.
And how is mindfulness of breathing developed and cultivated so that it is of great fruit and great benefit?
Here a disciple, having gone to the forest, to the root of a tree, or to an empty hut, sits down, folding his legs crosswise, setting his body erect, and establishing mindfulness on itself.
Ever mindful, he breathes in; ever mindful, he breathes out.
Breathing in long, he knows, I breathe in long; or breathing out long, he knows, I breathe out long.
Breathing in short, he knows, I breathe in short; or breathing out short, he knows, I breathe out short.
He trains himself, I will breathe in experiencing the whole body; he trains himself, I will breathe out experiencing the whole body.
He trains himself, I will breathe in calming the bodily formation; he trains himself, I will breathe out calming the bodily formation.
He trains himself, I will breathe in experiencing rapture; he trains himself, I will breathe out experiencing rapture.
He trains himself, I will breathe in experiencing pleasure; he trains himself, I will breathe out experiencing pleasure.
He trains himself, I will breathe in experiencing the mental formation; he trains himself, I will breathe out experiencing the mental formation.
He trains himself, I will breathe in calming the mental formation; he trains himself, I will breathe out calming the mental formation.
He trains himself, I will breathe in experiencing the mind; he trains himself, I will breathe out experiencing the mind.
He trains himself, I will breathe in gladdening the mind; he trains himself, I will breathe out gladdening the mind.
He trains himself, I will breathe in concentrating the mind; he trains himself, I will breathe out concentrating the mind.
He trains himself, I will breathe in liberating the mind; he trains himself, I will breathe out liberating the mind.
He trains himself, I will breathe in contemplating impermanence; he trains himself, I will breathe out contemplating impermanence.
He trains himself, I will breathe in contemplating fading away; he trains himself, I will breathe out contemplating fading away.
He trains himself, I will breathe in contemplating cessation; he trains himself, I will breathe out contemplating cessation.
He trains himself, I will breathe in contemplating relinquishment; he trains himself, I will breathe out contemplating relinquishment.
Disciples, when mindfulness of breathing is developed and cultivated in this way, it is of great fruit and great benefit.