[518] "'The fourth jhāna (jhāna), the fourth jhāna,' it is said. What now is the fourth jhāna? Then, friends, this occurred to me: Here a bhikkhu, with the abandoning of pleasure and the abandoning of pain, and with the previous passing away of joy and grief, enters and dwells in the fourth jhāna, which is neither-painful-nor-pleasant and has purity of mindfulness by equanimity. This is called the fourth jhāna.
Then, friends, with the abandoning of pleasure and the abandoning of pain, and with the previous passing away of joy and grief, I entered and dwelt in the fourth jhāna, which is neither-painful-nor-pleasant and has purity of mindfulness by equanimity. While I was dwelling in that dwelling, perceptions and attention accompanied by pleasure beset me. Then, friends, the Blessed One approached me by means of psychic power (iddhi) and said this: 'Moggallāna, Moggallāna! Do not be negligent, brahmin, regarding the fourth jhāna. Steady your mind (citta) in the fourth jhāna; unify your mind in the fourth jhāna; concentrate your mind in the fourth jhāna.'
Then, friends, on a later occasion, with the abandoning of pleasure and the abandoning of pain, and with the previous passing away of joy and grief, I entered and dwelt in the fourth jhāna, which is neither-painful-nor-pleasant and has purity of mindfulness by equanimity. For if, friends, one speaking rightly could say of anyone … 'has attained to greatness of direct knowledge (mahābhiññatā).'"
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.