[857] Again, furthermore, Ānanda, when a bhikkhu has heard a sound with the ear, there arises the agreeable (manāpa), there arises the disagreeable (amanāpa), there arises the both-agreeable-and-disagreeable. He understands thus: 'There has arisen in me this agreeable, there has arisen the disagreeable, there has arisen the both-agreeable-and-disagreeable; and that is conditioned (saṅkhata), coarse, dependently arisen. This is peaceful, this is sublime, namely, equanimity.' In him that arisen agreeable, that arisen disagreeable, that arisen both-agreeable-and-disagreeable ceases, and equanimity becomes established. Just as, Ānanda, a strong man might snap his fingers with little difficulty, even so, Ānanda, in whomever the arisen agreeable, the arisen disagreeable, the arisen both-agreeable-and-disagreeable ceases thus swiftly, thus quickly, thus with little difficulty, and equanimity becomes established — this, Ānanda, is called, in the discipline of the Noble One, the unsurpassed development of the faculties (indriyabhāvanā) regarding sounds cognizable by the ear.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.