HKB
Reply Obj. 1: As stated in the First Part (Q. 14, A. 13) the certitude of the Divine foreknowledge does not exclude the contingency of future singular events, because that knowledge regards the future as present and already determinate to one thing. Wherefore prophecy also, which is an "impressed likeness" or "seal of the Divine foreknowledge," does not by its unchangeable truth exclude the contingency of future things.
Reply Obj. 2: The Divine foreknowledge regards future things in two ways. First, as they are in themselves, in so far, to wit, as it sees them in their presentiality: secondly, as in their causes, inasmuch as it sees the order of causes in relation to their effects. And though future contingencies, considered as in themselves, are determinate to one thing, yet, considered as in their causes, they are not so determined but that they can happen otherwise. Again, though this twofold knowledge is always united in the Divine intellect, it is not always united in the prophetic revelation, because an imprint made by an active cause is not always on a par with the virtue of that cause. Hence sometimes the prophetic revelation is an imprinted likeness of the Divine foreknowledge, in so far as the latter regards future contingencies in themselves: and such things happen in the same way as foretold, for example this saying of Isa. 7:14: "Behold a virgin shall conceive." Sometimes, however, the prophetic revelation is an imprinted likeness of the Divine foreknowledge as knowing the order of causes to effects; and then at times the event is otherwise than foretold. Yet the prophecy does not cover a falsehood, for the meaning of the prophecy is that inferior causes, whether they be natural causes or human acts, are so disposed as to lead to such a result. In this way we are to understand the saying of Isa. 38:1: "Thou shalt die, and not live"; in other words, "The disposition of thy body has a tendency to death": and the saying of Jonah 3:4, "Yet forty days, and Nineveh shall be destroyed," that is to say, "Its merits demand that it should be destroyed." God is said "to repent," metaphorically, inasmuch as He bears Himself after the manner of one who repents, by "changing His sentence, although He changes not His counsel" [*Cf. I, Q. 19, A. 7, ad 2].
Reply Obj. 3: Since the same truth of prophecy is the same as the truth of Divine foreknowledge, as stated above, the conditional proposition: "If this was prophesied, it will be," is true in the same way as the proposition: "If this was foreknown, it will be": for in both cases it is impossible for the antecedent not to be. Hence the consequent is necessary, considered, not as something future in our regard, but as being present to the Divine foreknowledge, as stated in the First Part (Q. 14, A. 13, ad 2).
QUESTION 172
OF THE CAUSE OF PROPHECY (In Six Articles)
We must now consider the cause of prophecy. Under this head there are six points of inquiry:
(1) Whether prophecy is natural?
(2) Whether it is from God by means of the angels?
(3) Whether a natural disposition is requisite for prophecy?
(4) Whether a good life is requisite?
(5) Whether any prophecy is from the demons?
(6) Whether prophets of the demons ever tell what is true?
FIRST ARTICLE [II-II, Q. 172, Art. 1]
Whether Prophecy Can Be Natural?
Objection 1: It would seem that prophecy can be natural. For Gregory says (Dial. iv, 26) that "sometimes the mere strength of the soul is sufficiently cunning to foresee certain things": and Augustine says (Gen. ad lit. xii, 13) that the human soul, according as it is withdrawn from the sense of the body, is able to foresee the future [*Cf. I, Q. 86, A. 4, ad 2]. Now this pertains to prophecy. Therefore the soul can acquire prophecy naturally.