The spirits of the ancient Gadiantons are around us.

Brigham Young (President)
The spirits of the ancient Gadiantons are around us. You may see battle-field after battle-field, scattered over this American continent, where the wicked have slain the wicked. Their spirits are watching us continually for an opportunity to influence us to do evil, or to make us decline in the performance of our duties. And I will defy any man on earth to be more gentlemanly and bland in his manners than the master spirit of all evil. We call him the devil; a gentleman so smooth and so oily, that he can almost deceive the very elect. We have been baptized by men having the authority of the holy Priesthood of the Son of God, and consequently we have power over him which the rest of the world do not possess, and all who possess the power of the Priesthood have the power and right to rebuke those evil powers, and if they obey not, it is because we do not live so as to have the power with God, which it is our privilege to have. If we do not live for this privilege and right we are under condemnation. (Journal of Discourses, 12:128)