According to Peck, an 'evil' person:
Is consistently self deceiving, with the intent of avoiding guilt and maintaining a self image of perfection.
Deceives others as a consequence of their own self deception.
Projects his or her evils and sins onto very specific targets (scapegoats) while being apparently normal with everyone else.
Commonly hates with the pretense of love, for the purposes of self deception as much as deception of others.
Abuses political (emotional) power ("the imposition of one's will upon others by overt or covert coercion").
Maintains a high level of respectability, and lies incessantly in order to do so.
Is consistent in his or her sins. Evil persons are characterized not so much by the magnitude of their sins, but by their consistency (of destructiveness).
Is unable to think from the viewpoint of their victim (scapegoat).
Has a covert intolerance to criticism and other forms of narcissistic injury.
Most evil people realize the evil deep within themselves but are unable to tolerate the pain of introspection or admit to themselves that they are evil. Thus, they constantly run away from their evil by putting themselves in a position of moral superiority and putting the focus of evil on others. Evil is an extreme form of what Scott Peck, in The Road Less Traveled, calls a character disorder.
***Peck also stated that these people are rarely seen by psychiatrists and have never been treated successfully when treatment is initiated. Have a great day everyone!