Thomas Aquinas’ Argument
The believer’s intellect assents to that which he believes, not because he sees it either in itself, or by resolving it to self-evident principles, but because his will commands his intellect to assent. Now, that the will moves the intellect to assent may be due to two causes.Â
First, through the will being directed to the good, and in this way, to believe is a praiseworthy action. Secondly, because the intellect is convinced that it ought to believe what is said, though that conviction is not based on objective evidence.
Thus if a prophet, while preaching the word of God, were to foretell something, and were to give a sign by raising a dead person to life, the intellect of a witness would be convinced so as to recognize clearly that God was speaking, even though the thing foretold would not be self-evident, and consequently, the essence of faith would not be removed.
Accordingly, we must say that faith is commended in the first sense in the faithful of Christ, and in this way, faith is not in the demons. But only in the second way, for demons see many evident signs, whereby they recognize that the teaching of the Church is from God, although they do not see the things themselves that the Church teaches, for instance, that there are three Persons in God, and so forth.
Objection 1: Faith is good, but demons are not
It seems that the demons have no faith. Augustine says that faith depends on the believer’s will and this is a good will, since by it man wishes to believe in God. Since no deliberate will of the demons is good, it seems that there is no faith in the demons.
Aquinas’ Response
The demons are, in a way, compelled to believe, by the evidence of signs, so their will deserves no praise for their belief.
Objection 2: Faith is a gift
Further, Faith is a gift of Divine grace, according to Eph. 2:8: By grace you are saved through faith, … for it is the gift of God. Now, according to a gloss on Osee 3:1, They look to strange gods, and love the husks of the grapes, the demons lost their gifts of grace by sinning. Therefore faith did not remain in the demons after they sinned.
Aquinas’ Response
Faith, which is a gift of grace, inclines man to believe, by giving him a certain affection for the good, even when that faith is lifeless. Consequently, the faith which the demons have is not a gift of grace. Rather they are compelled to believe through their natural intellectual acumen.
Objection 3: Demons are worse than man
Further, Unbelief would seem to be graver than other sins, as Augustine observes in John 15:22, If I had not come and spoken to them, they would not have sin: but now they have no excuse for their sin. Now the sin of unbelief is in some men.
Consequently, if the demons have faith, some men would be guilty of a sin graver than that of the demons, which seems unreasonable. Therefore in the demons, there is no faith.
Aquinas’ Response
The very fact that the signs of faith are so evident, that the demons are compelled to believe, is displeasing to them. Therefore, their malice is by no means diminished by their belief.