"Because of the surpassing greatness of the revelations, for this reason, to keep me from exalting myself, there was given me a thorn in the flesh, a messenger of Satan to torment me - to keep me from exalting myself!" -Paul, 2 Corinthians 12:7
If I had to guess the enemy's psychologic makeup, I would hypothesize narcissism is a big part of who he is. After all, he thought he could be bigger than God, and he is the epitome of everything bad that exists in all of creation.
Often people wonder why we Christians choose to follow Christ, and what difference it makes in our lives. (They also wonder what, if anything is different from us versus anyone else, but that's a whole other topic altogether!)