You believe that there is one God; you do well: the demons also believe, and tremble.
All Commentaries on James 2:19 Go To James 2
Augustine of Hippo
AD 430
Those who believe and act according to true faith do live and are not dead, but those who do not believe, or else who believe like the demons, trembling but living evilly, proclaiming the Son of God but not having love, must rather be accounted dead. (Tractates 22.7.2)