On December 9th John Stackhouse had a blog post which contained these quotes from Walter Hilton. Hilton offered a way for us to determine if we truly love our enemies. Here is the quote.
What it really comes to is this: if you are not stirred up against such a person in anger while faking an outward cheer, and have no secret hatred in your heart, despising him or judging him or considering him worthless; if the more shame and villainy he does to you in word or deed, the more pity and compassion you show toward him, almost as you would for someone who was emotionally or mentally distressed; and if you are so compelled by love that you actually cannot find it in your heart to hate him, but instead you pray for him, help him out, and desire his amending (not only with your mouth, as hypocrites do, but with a true feeling of love in your heart): then you will be in perfect charity toward [him]. . . .
. . . Stop and think how Christ loved Judas, who was both his mortal enemy and a sinful dog. How good Christ was to him, how benign, how courteous, how humble toward him whom he knew to be damnable. He chose him for his apostle and sent him to preach with the other apostles. He gave him power to work miracles. He showed to him the same good cheer in word and deed. He shared with him his precious Body, and preached to him in the same manner as he did to the other apostles. He did not condemn him openly; nor did he abuse him or despise him, nor ever speak evil of him (and yet even if he had done all of that, it would simply have been to tell the truth!). And above all, when Judas seized him, he kissed him and called him his friend.