prophet that fulfils the duty of procreation." Much more therefore does a natural indisposition hinder prophecy; and thus it would seem that a good natural disposition is requisite for prophecy.
On the contrary, Gregory says in a homily for Pentecost (xxx in Ev.): "He," namely the Holy Ghost, "fills the boy harpist and makes him a Psalmist; He fills the herdsman plucking wild figs, and makes him a prophet." Therefore prophecy requires no previous disposition, but depends on the will alone of the Holy Ghost, of Whom it is written (1 Cor. 12:2): "All these things, one and the same Spirit worketh, dividing to every one according as He will."
I answer that, As stated above (A. 1), prophecy in its true and exact sense comes from Divine inspiration; while that which comes from a natural cause is not called prophecy except in a relative sense. 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. More than this, He is able at the same time, by creation, to produce the subject, so as to dispose a soul for prophecy and give it the prophetic grace, at the very instant of its creation.
Reply Obj. 1: It matters not to prophecy by what comparisons the thing prophesied is expressed; and so the Divine operation makes no change in a prophet in this respect. Yet if there be anything in him incompatible with prophecy, it is removed by the Divine power.
Reply Obj. 2: The considerations of science proceed from a natural cause, and nature cannot work without a previous disposition in matter. This cannot be said of God Who is the cause of prophecy.
Reply Obj. 3: 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.
FOURTH ARTICLE [II-II, Q. 172, Art. 4]
Whether a Good Life Is Requisite for Prophecy?
Objection 1: It would seem that a good life is requisite for prophecy. For it is written (Wis. 7:27) that the wisdom of God "through nations conveyeth herself into holy souls," and "maketh the friends of God, and prophets." Now there can be no holiness without a good life and sanctifying grace. Therefore prophecy cannot be without a good life and sanctifying grace.
Obj. 2: Further, secrets are not revealed save to a friend, according to John 15:15, "But I have called you friends, because all things whatsoever I have heard of My Father, I have made known to you." Now God reveals His secrets to the prophets (Amos 3:7). Therefore it would seem that the prophets are the friends of God; which is impossible without charity. Therefore seemingly prophecy cannot be without charity; and charity is impossible without sanctifying grace.
Obj. 3: Further, it is written (Matt. 7:15): "Beware of false prophets, who come to you in the clothing of sheep, but inwardly they are ravening wolves." Now all who are without grace are likened inwardly to a ravening wolf, and consequently all such are false prophets. Therefore no man is a true prophet except he be good by grace.