[641] Setting at Sāvatthī. "Bhikkhus, the perception of a skeleton (aṭṭhikasaññā), when developed and cultivated, is of great fruit and great benefit. And how, bhikkhus, is the perception of a skeleton developed, how is it cultivated, so that it is of great fruit and great benefit? Here, bhikkhus, a bhikkhu develops the factor of awakening (bojjhaṅga) of mindfulness accompanied by the perception of a skeleton, dependent on seclusion (viveka), dependent on dispassion (virāga), dependent on cessation, maturing in relinquishment (vossagga) … he develops the factor of awakening of equanimity accompanied by the perception of a skeleton, dependent on seclusion, dependent on dispassion, dependent on cessation, maturing in relinquishment. It is when the perception of a skeleton is developed in this way, bhikkhus, cultivated in this way, that it is of great fruit and great benefit."
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.