“Bhikkhus, if one were to say of anything ‘a heap of the wholesome, ’ it is about the four establishments of mindfulness that one could rightly say this. For this is a complete heap of the wholesome, that is, the four establishments of mindfulness. What four? sn.v.187
“Here, bhikkhus, a bhikkhu dwells contemplating the body in the body … feelings in feelings … mind in mind … phenomena in phenomena, ardent, clearly comprehending, mindful, having removed covetousness and displeasure in regard to the world.
“If, bhikkhus, one were to say of anything ‘a heap of the wholesome, ’ it is about these four establishments of mindfulness that one could rightly say this. For this is a complete heap of the wholesome, that is, the four establishments of mindfulness.”