The Church condemns evil doctrine, and says that her condemnation falls upon such as knowingly and deliberately identify themselves with the condemned doctrine. The gentle Christ said, “If a man will not hear the Church, let him be as the heathen.” St. Paul says, “If any man preach any other doctrine, let him be accursed.” Gal. L, 8. St. Paul meant that in the Catholic sense I have explained. Love your enemies, by all means. But if you do, you will hate the evil which is to their harm. Hatred of that evil proves your love for them. If you did not love them, you would be utterly indifferent, and it would not matter to you what they believed or did. Or you might even rejoice to see them with the wrong doctrine, and deliberately refrain from uttering any warning. An interdict is but a suspension of public services in a given place when the people no longer deserve them, and then only in the hope that this grave penalty will bring them to a better frame of mind. Excommunication is but an official declaration that persons have behaved so badly that they have already cut themselves off from the grace of God, and therefore from the soul of the Church by their sin. And this official sentence, too, is but an effort to bring them to a better frame of mind. The intention is really to help such people in the end.
Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty