2.
The Discourse on the Factors of Enlightenment
978.
"Mindfulness of breathing, monks, when developed and cultivated, is of great fruit and great benefit.
And how, monks, is mindfulness of breathing developed, how is it cultivated, so that it is of great fruit and great benefit?
Here, monks, a monk develops the enlightenment factor of mindfulness accompanied by mindfulness of breathing, based upon seclusion, based upon dispassion, based upon cessation, maturing in release; he develops the enlightenment factor of investigation of phenomena accompanied by mindfulness of breathing, etc.
He develops the enlightenment factor of equanimity accompanied by mindfulness of breathing, based upon seclusion, based upon dispassion, based upon cessation, maturing in release.
Thus developed, monks, mindfulness of breathing, thus cultivated, is of great fruit and great benefit."
The second.