Galatians 1 (viii)

You must build on God's word so firmly and certainly that even if I were to become a fool (which God forbid!) and were to contradict or deny what I once taught, then you would not deviate from it, but would say: "Even if Luther or an angel from Heaven were to teach something different, then it would be false." For you are not to be students of Luther but of Christ and you are to receive God's Word without wavering, even if the whole world fights against it.

The complete Luther - "A Meditation for Each Day of the Year" is available as a biligual (English and German) BREVIARY published by Wartburg Verlag Weimar. It can be purchased in English, world-wide from most internet book shops.