Psalms 139:21

Yet, it is not hard for us, if we wish it, to take up a love for justice and a hatred for iniquity. God has advantageously given all power to the rational soul, as that of loving, so also that of hating, in order that, guided by reason, we may love virtue but hate vice. It is possible at times to use hatred even praiseworthily. "Have I not hated them, O Lord, that hated you and pined away because of your enemies? I have hated them with a perfect hatred."

I also ask and beg of you to expound for me what [Paul] says to the Romans, for I admit I have very poor sight for this opinion of the apostle about the Jews, where he says, "As concerning the gospel, indeed they are enemies for your sake, but as touching the election they are most dear for the sake of the ancestors." How can these same ones be enemies for our sake, now that we former Gentiles have become believers, as if Gentiles could only believe if the Jews had refused to believe? Is not God the one Creator of all, "who will have all people to be saved and to come to the knowledge of the truth," and was he not able to gain both without dispossessing one for the other? Second, "most dear for the sake of the ancestors": how or why this "most dear," if they do not believe and if they continue to be enemies of God? "O God," he says, "have I not hated them that hated you and pined away because of your enemies? I have hated them with a perfect hatred." Certainly, I think the Father's voice speaks to his Son by the prophet in the same psalm where he spoke on behalf of believers: "But to me your friends, O God, are made exceedingly honorable; their dominions are exceedingly strengthened." How can it be profitable for their salvation to be "most dear to God for the sake of the ancestors" when salvation is acquired only through the faith and grace of Christ? What good does it do them to be loved, when they are inevitably to be damned because of their unbelief, because they have fallen away from the faith of the prophets and of the patriarchs, their ancestors, and have become enemies of the gospel of Christ? If they are most dear to God, how shall they be lost? And if they do not believe, how can they fail to be lost? If they are loved for the sake of the ancestors, without any merit of their own, why will they not be saved for the sake of the ancestors, too? "And if, Noah, Daniel and Job shall be in the midst thereof, they shall not deliver the wicked children: they shall be delivered."

And then He tells what meanwhile, during this whole time when He already has risen, and remains still with the Father, He suffers by the intermixture of sinners in His Body, the Church, and by the separation of heretics. "If Thou, O God, shall slay the sinners (since You shall say in Your thought, Depart from Me, you men of blood), they shall receive in vanity their cities" (ver. 19-20). The words seem to be connected in this order; "If Thou, O God, shall slay the sinners, they shall receive in vanity their cities." Thus are sinners slain, because, "having their understandings darkened, they are alienated from the life of God." [Ephesians 4:18] For on account of elation they lose confession, and so they are slain, and in them is fulfilled what Scripture says, "Confession perishes from the dead, as from one that is not." [Sirach 17:28] And so "they receive in vanity their cities," that is, their vain peoples, who follow their vanity; when, puffed up by the name of righteousness, they persuade men to burst the bond of unity, and blindly and ignorantly follow them, as being more righteous....But now the Body of Christ, the Church, says, Why do the proud speak falsely against me, as though I were stained by other men's sins, and so, by separating themselves, "receive in vanity their cities"? "Have not I hated those who hated You, Lord?" [Psalm 139:21]. Why do those who are worse themselves require of me to separate myself in body as well as spirit from the wicked, so as to root up the wheat, together with the tares, before the time of harvest, that before the time of winnowing I lose my power of enduring the chaff; that before all the different sorts of fishes are brought to the end of the world, as to the shore, to be separated, I tear the nets of peace and unity? Are the sacraments which I receive, those of evil men? Do I; by consent, communicate in their life and deeds?...But where is, "Love your enemies"? Is it because He said "yours," not "God's"? "Do good to them that hate you." [Matthew 5:44] He says not, "who hate God." So he follows the pattern, and says, "Have not I hated those who hated You; Lord?" He says not, "Who have hated me." "And at Your enemies did I waste away." "Yours," he said, not "mine." But those who hate us and are enemies unto us, only because we serve Him, what else do they but hate Him, and are His enemies. Ought we then to love…