“…it must be clearly noted that the devil is not a “red-suited gentleman” nor any other type of grossly-physical tempter. He is a subtle, intelligent spirit who acts mostly by deceit and hidden actions, having as his greatest victory man’s disbelief in his existence and power…For the greatest part of his warfare he is only too satisfied to remain concealed and to act by indirect methods and means.”
(Protopresbyter Thomas Hopko+, ‘The Orthodox Faith’)