Martin Luther gives good advice to Christians:

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 that moment attacking, I am not confessing Christ, however boldly I may be professing Christ. Where the battle rages there the loyalty of the soldier is proved. And to be steady on all the battlefields beside is merely flight and disgrace if he flinches at that point.

I found this quoted in an article Marriage and the Seinfeld Effect

(ht:kd)