Ambrose of Milan
Catena Aurea · Lukasevangelium 6
But I say unto you which hear, Love your enemies, do good to them which hate you, Bless them that curse you, and pray for them which despitefully use you. And unto him that smiteth thee on the one cheek offer also the other; and him that taketh away thy cloke forbid not to take thy coat also. Give to every man that asketh of thee; and of him that taketh away thy goods ask them not again. And as ye would that men should do to you, do ye also to them likewise.
Having proceeded in the enumeration of many heavenly actions, He not unwisely comes to this place last, that He might teach the people confirmed by the divine miracles to march onward in the footsteps of virtue beyond the path of the law. Lastly, among the three greatest, (hope, faith, and charity,) the greatest is charity, which is commanded in these words, Love your enemies.