One of my favorite quotes from Luther is:
"The devil has no better way to conquer us than by leading us away from the Word and to the Spirit."
Table Talk 54.97
I ran across it in Stephen Westerholm's Perspectives Old and New On Paul [p.32 n.10]. (Westerholm's book is one you should read--particularly if you are unfamiliar with Luther and Calvin but you're into NT studies).
With regard to Luther's quote I have found it pastoral applicable more times than I care to count.