See to it that no one render unto any one evil for evil (horate mē tis kakon anti kakou apodōi). Note mē with the aorist subjunctive (negative purpose) apodōi from apodidōmi, to give back. Retaliation, condemned by Jesus (Mat 5:38-42) and by Paul in Rom 12:17, usually takes the form of “evil for evil,” rather than “good for good” (kalon anti kalou). Note idea of exchange in anti.
Follow after (diōkete). Keep up the chase (diōkō) after the good.