[646] "And how, friends, is the mind (citta) said to be stuck internally (ajjhattaṃ saṇṭhitaṃ)? Here, friends, a bhikkhu, secluded from sensual pleasures, secluded from unwholesome states, enters upon and dwells in the first jhāna, which is accompanied by applied thought (vitakka) and sustained thought (vicāra), with rapture (pīti) and pleasure born of seclusion. His consciousness follows after the rapture and pleasure born of seclusion; it is tied to gratification in the rapture and pleasure born of seclusion, bound by gratification in the rapture and pleasure born of seclusion, fettered by the fetter of gratification in the rapture and pleasure born of seclusion — thus the mind is said to be stuck internally.
Again, friends, with the stilling of applied thought and sustained thought, a bhikkhu enters upon and dwells in the second jhāna, which has internal confidence and unification of mind, is without applied thought, without sustained thought, with rapture and pleasure born of concentration (samādhi). His consciousness follows after the rapture and pleasure born of concentration; it is tied to gratification in the rapture and pleasure born of concentration, bound by gratification in the rapture and pleasure born of concentration, fettered by the fetter of gratification in the rapture and pleasure born of concentration — thus the mind is said to be stuck internally.
Again, friends, with the fading away of rapture, a bhikkhu dwells equanimous, and mindful and clearly comprehending, and he experiences pleasure with the body; he enters upon and dwells in the third jhāna, on account of which the noble ones declare of him: 'Equanimous and mindful, he dwells in pleasure.' His consciousness follows after that equanimity; it is tied to gratification in the pleasure of equanimity, bound by gratification in the pleasure of equanimity, fettered by the fetter of gratification in the pleasure of equanimity — thus the mind is said to be stuck internally.
Again, friends, with the abandoning of pleasure and the abandoning of pain, and with the previous disappearance of joy and grief, a bhikkhu enters upon and dwells in the fourth jhāna, which is neither-painful-nor-pleasant and has purity of mindfulness due to equanimity. His consciousness follows after the neither-painful-nor-pleasant [feeling]; it is tied to gratification in the neither-painful-nor-pleasant, bound by gratification in the neither-painful-nor-pleasant, fettered by the fetter of gratification in the neither-painful-nor-pleasant — thus the mind is said to be stuck internally. It is in this way, friends, that the mind is said to be stuck internally."
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.