Milton has given absolute power to the reason and free will of both men and Satan, only to show that the mind can defeat itself—using reason to arrive at an unreasonable position. Satan’s thoughts are increasingly contradictory and confusing, becoming hard for us, and perhaps for himself, to follow. Satan comes to believe his own faulty logic and his own lies. In Books I and II, his ability to reason is strong, but now in Book IX he can hardly form a coherent argument. Ironically, Satan has proved the truth of his own earlier statement that the mind can make a heaven of hell or a hell of heaven. Satan intended to make a heaven out of Hell, where he would be an evil version of God. Instead, he has brought his torture with him, and made a hell out of the earth that, but for him, would be heavenly.