It goes that without saying that one can defeat an enemy better by knowing how they are. It makes since to me that the Devil's Bible may give with out a doubt clues to how the devil really is and his true nature. The old saying is that you keep your friends close but your enemies closer. That is without doubt how things are.
I consider the Devil my enemy and I think it would be wise to know how he and his followers think and that they can be stopped by knowing how to defeat them at their own game.