We will boast of nothing but the Holy Scriptures, continually mindful that the Holy Spirit cannot contradict himself, for he is not a God of discord, but a God of peace and harmony [II Cor. 13:11].

Luther, M. (1999, c1959). Vol. 36: Luther’s works, vol. 36 : Word and Sacrament II (J. J. Pelikan, H. C. Oswald & H. T. Lehmann, Ed.). Luther’s Works (36:III-160). Philadelphia: Fortress Press.