The world bears the Gospel a grudge because the Gospel condemns the religious wisdom of the world. Jealous for its own religious views, the world in turn charges the Gospel with being a subversive and licentious doctrine, offensive to God and man, a doctrine to be persecuted as the worst plague on earth. As a result we have this paradoxical situation: The Gospel supplies the world with the salvation of Jesus Christ, peace of conscience, and every blessing. Just for that the world abhors the Gospel.

From Luther’s Introduction (1538), Commentary on Galatians