But the devil is perfectly happy when the people of God defend the Word of God, when they understand the Word of God and when they memorize the Word of God. What drives him batty, however, is when we believe the Word of God. That, finally, is what we are called to do.
Of course it is difficult to believe what could contain error. It is likewise difficult to believe what you don't understand. And it is most difficult to believe what you know not of. But all the defending, understanding and memorizing in the world won't help you without the believing. The devil himself knows the Bible is without error. He understands it far better than any of us. And I wouldn't be surprised if he has memorized the whole thing. Look how much good it's done him.
Knowledge is relatively easy to attain. It's putting it into practice that's so hard.