The highest, the only proof of love, is to love our adversary; as did the Truth Himself, who while He suffered on the cross, shewed His love for His persecutors: Father, forgive them, for they know not what they do. (Luke 23:34) Of which love the consummation is given in the next words: Greater love hath no man than this, that a man lay down his life for his friends. Our Lord came to die for His enemies, but He says that He is going to lay down His life for His friends, to shew us that by loving, we are able to 1 gain over our enemies, so that they who persecute us are by anticipation our friends.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Hom. xxvii.