6.
The Discourse on Final Liberating Knowledge
402.
"Monks, there are these four establishments of mindfulness.
Which four?
Here, monks, a monk dwells observing the body in the body, ardent, fully aware, mindful, having removed covetousness and displeasure regarding the world;
in feelings... etc.
In mind... etc.
He dwells observing mental phenomena in mental phenomena, ardent, fully aware, mindful, having removed covetousness and displeasure regarding the world.
These, monks, are the four establishments of mindfulness.
Because of having developed and cultivated these four establishments of mindfulness, monks, one of two fruits is to be expected:
final liberating knowledge in this very life; or, if there is a residue of clinging, non-returning."
The sixth.