Gregory the Great — as excerpted in the Catena Aurea on Luke 14:25-27

“(in Hom. ut sup.) But it may be asked, how are we bid to hate our parents and our relations in the flesh, who are commanded to love even our enemies? But if we weigh the force of the command we are able to do both, by rightly distinguishing them so as both to love those who are united to us by the bond of the flesh, and whom we acknowledge our relations, and by hating and avoiding not to know those whom we find our enemies in the way of God. For he is as it were loved by hatred, who in his carnal wisdom, pouring into our ears his evil sayings, is not heard.”