[321] "But what, Master Ānanda, was that noble aggregate of concentration (samādhikkhandha) of which the worthy Gotama spoke in praise, and in which he caused this multitude to undertake, wherein he settled them and established them?"
"And how, young brahmin, is a bhikkhu one who guards the doors of the sense faculties (indriya)? Here, young brahmin, a bhikkhu, having seen a form with the eye, does not grasp at the signs (nimitta) nor grasp at the details (anubyañjana). Since, were he to dwell with the eye faculty unrestrained, evil, unwholesome states of covetousness and grief (abhijjhā-domanassa) might flow in upon him, he practices for its restraint; he guards the eye faculty; he attains restraint over the eye faculty. Having heard a sound with the ear … having smelled an odor with the nose … having tasted a flavor with the tongue … having touched a tangible with the body … having cognized a mental object (dhamma) with the mind, he does not grasp at the signs nor grasp at the details. Since, were he to dwell with the mind faculty unrestrained, evil, unwholesome states of covetousness and grief might flow in upon him, he practices for its restraint; he guards the mind faculty; he attains restraint over the mind faculty. Endowed with this noble restraint of the sense faculties, he experiences within himself an unsullied happiness (abyāsekasukha). Thus indeed, young brahmin, is a bhikkhu one who guards the doors of the sense faculties."
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.