The Buddha describes the power of mindfulness (satindriya) in today’s Pali exercise:
“Katamañca, bhikkhave, satindriyaṃ? Idha, bhikkhave, ariyasāvako satimā hoti paramena satinepakkena samannāgato, cirakatampi cirabhāsitampi saritā anussaritā. So kāye kāyānupassī viharati ātāpī sampajāno satimā, vineyya loke abhijjhādomanassaṃ; vedanāsu … Pe … Citte … Pe … Dhammesu dhammānupassī viharati ātāpī sampajāno satimā, vineyya loke abhijjhādomanassaṃ — idaṃ vuccati, bhikkhave, satindriyaṃ.”
And what, bhikkhus, is the power of mindfulness? Here, bhikkhus, a disciple of the noble ones is mindful, endowed with excellent, careful alertness, remembering things long since said and done. He abides as a body observing the body, ardent, attentive, contemplative, letting go of desire for and distress about the world. He abides as feeling tones observing feeling tones…He abides as heart and mind observing heart and mind…He abides as phenomena observing phenomena, ardent, attentive, contemplative, letting go of desire for and distress about the world. This, bhikkhus, is what I call the power of mindfulness.