Thomas Aquinas

“ Hence the teaching of the demons, with which they instruct their prophets, contains some truths whereby it is rendered acceptable. For the intellect is led astray to falsehood by the semblance of truth, even as the will is seduced to evil by the semblance of goodness. ”

“ On the other hand, future things can be foreknown in their causes with a natural knowledge even by man: thus a physician foreknows future health or death in certain causes, through previous experimental knowledge of the order of those causes to such effects. Such like knowledge of the future may be understood to be in a man by nature in two ways. In one way that the soul, from that which it holds, is able to foreknow the future, and thus Augustine says (Gen. ad lit. xii, 13) : "Some have deemed the human soul to contain a certain power of divination." ”

“ A natural indisposition, if not removed, might be an obstacle to prophetic revelation, for instance if a man were altogether deprived of the natural senses. In the same way a man might be hindered from the act of prophesying by some very strong passion, whether of anger, or of concupiscence as in coition, or by any other passion. But such a natural indisposition as this is removed by the Divine power, which is the cause of prophecy. ”

“ Therefore even the prophets of the demons foretell the truth.
I answer that, As the good is in relation to things, so is the true in relation to knowledge. Now in things it is impossible to find one that is wholly devoid of good. Wherefore it is also impossible for any knowledge to be wholly false, without some mixture of truth. ”

“ Now we must observe that as God Who is the universal efficient cause requires neither previous matter nor previous disposition of matter in His corporeal effects, for He is able at the same instant to bring into being matter and disposition and form, so neither does He require a previous disposition in His spiritual effects, but is able to produce both the spiritual effect and at the same time the fitting disposition as requisite according to the order of nature. ”

“ Even dumb animals have no foreknowledge of future events, except as these are foreknown in their causes, whereby their imagination is moved more than man's, because man's imagination, especially in waking, is more disposed according to reason than according to the impression of natural causes. ”

“ Further, the considerations of prophecy are more lofty than those of acquired science. Now natural indisposition hinders the considerations of acquired science, since many are prevented by natural indisposition from succeeding to grasp the speculations of science. Much more therefore is a natural disposition requisite for the contemplation of prophecy. ”

“ Further, just as true prophets are inspired by the Spirit of truth, so the prophets of the demons are inspired by the spirit of untruth, according to 3 Kings 22:22, "I will go forth, and be a lying spirit in the mouth of all his prophets." ”

“ Yet reason effects much more amply in man, that which the impression of natural causes effects in dumb animals; and Divine grace by inspiring the prophecy assists man still more.
Reply to Objection 4: The prophetic light extends even to the direction of human acts; and in this way prophecy is requisite for the government of a people, especially in relation to Divine worship; since for this nature is not sufficient, and grace is necessary.
Art. 2 - Whether prophetic revelation comes through the angels? Objection 1: It would seem that prophetic revelation does not come through the angels. ”

“ Sometimes prophesying, the working of miracles, and the casting out of demons are accorded not to the merit of those who do these things, but either to the invoking the name of Christ, or to the condemnation of those who invoke, and for the good of those who see and hear. ”

“ Hence He foretells certain truths even by the demons' prophets, both that the truth may be rendered more credible, since even its foes bear witness to it, and also in order that men, by believing such men, may be more easily led on to truth. ”