"If I profess with the loudest voice and clearest exposition every portion of the truth of God except precisely that little point which the world and the devil are at the moment attacking, I am not confessing Christ, however boldly I may be professing Christianity. Where the battle rages, there the loyalty of the soldier is proved and to be steady on all the battle front besides, is mere flight and disgrace if he flinches at that point."

Francis Schaeffer cites it and attributes it to Luther in several of his works (The God Who is There, is one place), but he never gives any specific reference for it. The Presbyterian blogger Michael Marlowe makes this statement about it:

"The words that Schaeffer attributes to Martin Luther here (and elsewhere in his writings) sound very much like Luther, but they were actually written by the Victorian-era novelist, Elizabeth Charles. The words appear in her Chronicles of the Schönberg-Cotta Family, as if written by the fictional narrator Friedrich ("Fritz") Schönberg. The attribution to Luther was perhaps due to some confusion arising from the fact that in the context this character was explaining why he could not abandon Lutheranism."