The madness of sin - Cardinal Newman

"Wickedness is sometimes called madness in Scripture—so it is. As literal madness is derangement of the reason, so sin is derangement of the heart, of the spirit, of the affection. And as madness was the disorder in which possession by the devil showed itself in Scripture, so this madness of the heart and spirit is the disorder which in all ages the devil produces in the spirit. And as there are different forms of that madness which is derangement of the reason, so there are different forms of that worse madness which is sin. In an asylum there are different forms of the disorder, and so this whole world is one vast madhouse, of which the inmates, though shrewd enough in matters of this world, yet in spiritual matters are in one way or another mad."

Newman Reader