[769] "He should not speak contentious talk" — what is contentious talk?
Here someone (idhekacco) is a speaker of talk of such a kind as this: "You do not understand this Dhamma and Discipline … or disentangle yourself if you can." For this was said by the Blessed One: "Moggallāna, when there is contentious talk, an abundance of talk is to be expected; when there is an abundance of talk, there is restlessness; for one who is restless there is lack of restraint; for one who is unrestrained the mind (citta) is far from concentration (samādhi)."
"He should not speak contentious talk": he should not speak, should not utter, should not set forth, should not express contentious talk; he should abandon contentious talk, dispel it, make an end of it, bring it to non-existence; he should be one who abstains from contentious talk, refrains from it, desists from it, has departed from it, is released from it, is freed from it, is detached from it; he should dwell with a mind made free of limitations. Thus, "he should not speak contentious talk." Therefore the Blessed One said:
A bhikkhu should not be a boaster,
nor should he utter speech motivated by gain;
he should not train in impudence,
nor should he speak contentious talk.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.