Monks, one thing, when developed and cultivated, is of great fruit and benefit.

What one thing?

Mindfulness of Breathing (Breathing Mindfulness Meditation).

And how, Monks, is Mindfulness of Breathing (Breathing Mindfulness Meditation) developed and cultivated so that it is of great fruit and benefit?

Here, Monks, a Monk, having gone to the forest, to the foot of a tree, or to an empty hut, sits down. Having folded his legs crosswise, straightened his body, and set up mindfulness in front of him, just mindful he breathes in, 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 thus: Experiencing the whole body…. (Repeat as at Chapter 1)

He trains thus: Reflecting on letting go, I will breathe in;

he trains thus: Reflecting on letting go, I will breathe out.

It is, Monks, when Mindfulness of Breathing (Breathing Mindfulness Meditation) is developed and cultivated in this way that it is of great fruit and benefit.