He's staring into the face of fellow Israelites who don't know the grace of enemy love and who want to appeal too quickly to the lex talionis or who want to become judges like God (7:1—5; cf. Jas 4:11—12). Moreover, that same audience needed to hear that forgiveness is the way kingdom living works. Those who genuinely love others forgive. Those who don't are not kingdom people.
- Scot McKnight