[41] "And what, bhikkhus, is right concentration (sammāsamādhi)? Here, bhikkhus, a bhikkhu, secluded from sensual pleasures, secluded from unwholesome states, enters and dwells in the first jhāna, which is accompanied by thought (vitakka) and examination (vicāra), with rapture and pleasure born of seclusion. With the subsiding of thought and examination, he enters and dwells in the second jhāna, which has internal confidence and unification of mind (citta), is without thought and without examination, with rapture and pleasure born of concentration (samādhi). With the fading away of rapture, he dwells equanimous and, mindful and clearly comprehending, he experiences pleasure with the body; he enters and dwells in the third jhāna, of which the noble ones declare: 'He is equanimous, mindful, one who dwells in pleasure.' With the abandoning of pleasure and the abandoning of pain, and with the previous passing away of joy and grief, he enters and dwells in the fourth jhāna, which is neither-painful-nor-pleasant and has purity of mindfulness due to equanimity. This, bhikkhus, is called right concentration."
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.