They used to call the devil the father of lies. But for someone whose sin is meant to be pride, you'd think that lying would leave something of a sour taste. So my theory is that when the devil wants to get something out of you, he doesn't lie at all. He tells you the exact, literal truth. And he lets you find your own way to hell.
If men come unto me, I will show unto them their weakness. I give unto men weakness that they may be humble; and my grace is sufficient for all men that humble themselves before me; for if they humble themselves before me, and have faith in me, then will I make weak things become strong unto them.