Despising God's Mercy

Although God hates sin, still He is more forgiving toward all other sins than He is toward the contempt of His Son; that is He cannot bear to have His mercy despised. Therefore it is easy to judge what is in store for the papal crowd, which condemns the doctrine of faith as the most noxious heresy and persuades people to look to the protection of merits or works.

Source: Quoted in Ewald M. Plass, What Luther Says, A Practical In-home Theology for the Active Christian. St. Louis: Concordia Publishing House. 1959 Edition, 10th Printing (1994), p. 519.