Awakening FactorsBojjhaṅgasutta

“Mendicants, when mindfulness of breathing is developed and cultivated it’s very fruitful and beneficial.“Ānāpānassati, bhikkhave, bhāvitā bahulīkatā mahapphalā hoti mahānisaṁsā. And how is mindfulness of breathing developed and cultivated to be very fruitful and beneficial?Kathaṁ bhāvitā ca, bhikkhave, ānāpānassati kathaṁ bahulīkatā mahapphalā hoti mahānisaṁsā? It’s when a mendicant develops mindfulness of breathing together with the awakening factors of mindfulness,Idha, bhikkhave, bhikkhu ānāpānassatisahagataṁ satisambojjhaṅgaṁ bhāveti vivekanissitaṁ virāganissitaṁ nirodhanissitaṁ vossaggapariṇāmiṁ, investigation of principles, energy, rapture, tranquility, immersion,ānāpānassatisahagataṁ dhammavicayasambojjhaṅgaṁ bhāveti …pe… and equanimity, which rely on seclusion, fading away, and cessation, and ripen as letting go.ānāpānassatisahagataṁ upekkhāsambojjhaṅgaṁ bhāveti vivekanissitaṁ virāganissitaṁ nirodhanissitaṁ vossaggapariṇāmiṁ. Mindfulness of breathing, when developed and cultivated in this way, is very fruitful and beneficial.”Evaṁ bhāvitā kho, bhikkhave, ānāpānassati evaṁ bahulīkatā mahapphalā hoti mahānisaṁsā”ti.