Majjhima Nikaya 3:131
SUJATOYasmiṁ samaye, bhikkhave, bhikkhu tathāsamāhitaṁ cittaṁ sādhukaṁ ajjhupekkhitā hoti, upekkhāsambojjhaṅgo tasmiṁ samaye bhikkhuno āraddho hoti, upekkhāsambojjhaṅgaṁ tasmiṁ samaye bhikkhu bhāveti, upekkhāsambojjhaṅgo tasmiṁ samaye bhikkhuno bhāvanāpāripūriṁ gacchati.
equanimity.