The same setting. “Reverend, they speak of the one called ‘an adept’. How is an adept defined?” “Reverends, an adept is someone who has completely developed the four kinds of mindfulness meditation.

What four? It’s when a mendicant meditates by observing an aspect of the body—keen, aware, and mindful, rid of covetousness and displeasure for the world. They meditate observing an aspect of feelings … mind … principles—keen, aware, and mindful, rid of covetousness and displeasure for the world. An adept is someone who has completely developed the four kinds of mindfulness meditation.”

Linked Discourses 47.28 3. Ethics and Duration The World

The same setting. “Reverend Anuruddha, what things have you developed and cultivated to attain great direct knowledge?” “Reverend, I attained great direct knowledge by developing and cultivating the four kinds of mindfulness meditation.