Pseudo-Chrysostom — as excerpted in the Catena Aurea on Matthew 5:38-42

“For without this command, the commands of the Law could not stand. For if according to the Law we begin all of us to render evil for evil, we shall all become evil, since they that do hurt abound. But if according to Christ we resist not evil, though they that are evil be not amended, yet they that are good remain good.”