Many, even the wicked, are able to believe that the things he speaks are true; they believe that they are true and do not wish to make them their own because they are too lazy to do anything about them. Even the demons were able to believe, however, that he is God. But they alone know how to believe in God who love God, who are Christians not only in name but also in action and [way of] life, because without love faith is empty; with love it is the faith of a Christian, without love the faith of a demon.
[Bede the Venerable, Commentary on the Seven Catholic Epistles, Hurst, tr., Cistercian Publications (Kalamazoo, MI: 1985) p. 29.]