[328] "Again, student, further, with the abandoning of pleasure (sukha) and the abandoning of pain (dukkha), and with the previous disappearance of joy and grief (somanassa-domanassa), a bhikkhu enters and dwells in the fourth jhāna, which is neither-painful-nor-pleasant and has purity of mindfulness due to equanimity (upekkhāsatipārisuddhi). He sits pervading this very body with a mind purified and bright, so that there is no part of his whole body unpervaded by the purified and bright mind. Just as, student, a man might sit covered from head to foot with a white cloth, so that there would be no part of his whole body unpervaded by the white cloth — even so, student, a bhikkhu … . In that, student, a bhikkhu, with the abandoning of pleasure … enters and dwells in the fourth jhāna, and sits pervading this very body with a mind purified and bright, so that there is no part of his whole body unpervaded by the purified and bright mind — this too pertains to his concentration (samādhi).
"This, student, is that noble aggregate of concentration (samādhikkhandha) of which the Blessed One spoke in praise, and in which he encouraged, settled, and established this people. And herein there is still something further to be done."
"It is wonderful, worthy Ānanda! It is marvellous, worthy Ānanda! This noble aggregate of concentration is complete, not incomplete. And such a complete noble aggregate of concentration as this, worthy Ānanda, I do not see among other ascetics and brahmins outside of here. And were other ascetics and brahmins outside of here to see in themselves such a complete noble aggregate of concentration, they would be satisfied with just that much: 'This much suffices; this much has been done; the goal of the ascetic life has been attained by us; there is nothing further for us to do.' And yet the worthy Ānanda says: 'Herein there is still something further to be done.'"
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.