One thing I liked about both Captivating and Battlefield was that they both dealt with how the advesary will try to use your thoughts agaisnt you. And his favorite are thoughts of low self esteem, or self-worth. He likes to plant those thoughts in your head to make you think you don't deserve god.

I've always been the kind of person who thinks of myself, "I'm stupid," or gets down on myself for my actions, so both books really helped me in that aspect.