The only way, bhikkhus, is this path, for beings’ purification, for sorrow and lamentation’s overcoming, for pain and displeasure’s disappearance, for the true way’s attainment, for Nibbāna’s that is, the four foundations of mindfulness(cattāro sati∙paṭṭhānā). What are the four? Here, bhikkhus, [1] a bhikkhu abides contemplating the body in the body, ardent, discerning, and mindful, having removed covetousness and displeasure, for the world. [2] He abides contemplating feelings in feelings, ardent, discerning, and mindful, having removed covetousness and displeasure for the world. [3] He abides contemplating consciousness in consciousness, ardent, discerning, and mindful, having removed covetousness and displeasure for the world. [4] He abides contemplating dhammas in dhammas, ardent, discerning, and mindful, having removed covetousness and displeasure for the world. D.II.9 (§373)‘Mahā∙Sati∙Paṭṭhāna∙Suttaṃ’ (‘The Great Mindfulness-Foundation Sutta’)