[II-II.q.173.a.1.arg.1] It would seem that the prophets see the very essence of God, for a gloss on Isaiah 38:1, "Take order with thy house, for thou shalt die and not live," says: "Prophets can read in the book of God's foreknowledge in which all things are written." Now God's foreknowledge is His very essence. Therefore prophets see God's very essence.

[II-II.q.173.a.1.arg.2] Further, Augustine says (De Trin. ix, 7) that "in that eternal truth from which all temporal things are made, we see with the mind's eye the type both of our being and of our actions." Now, of all men, prophets have the highest knowledge of Divine things. Therefore they, especially, see the Divine essence.

[II-II.q.173.a.1.arg.3] Further, future contingencies are foreknown by the prophets "with unchangeable truth." Now future contingencies exist thus in God alone. Therefore the prophets see God Himself.

[II-II.q.173.a.1.sc] The vision of the Divine essence is not made void in heaven; whereas "prophecy is made void" (1 Corinthians 13:8). Therefore prophecy is not conveyed by a vision of the Divine essence.

[II-II.q.173.a.1.co] Prophecy denotes Divine knowledge as existing afar off. Wherefore it is said of the prophets (Hebrews 11:13) that "they were beholding . . . afar off." But those who are in heaven and in the state of bliss see, not as from afar off, but rather, as it were, from near at hand, according to Psalm 139:14, "The upright shall dwell with Thy countenance." Hence it is evident that prophetic knowledge differs from the perfect knowledge, which we shall have in heaven, so that it is distinguished therefrom as the imperfect from the perfect, and when the latter comes the former is made void, as appears from the words of the Apostle (1 Corinthians 13:10).

Some, however, wishing to discriminate between prophetic knowledge and the knowledge of the blessed, have maintained that the prophets see the very essence of God (which they call the "mirror of eternity") [Cf. De Veritate, xii, 6; Sent. II, D, XI, part 2, art. 2, ad 4, not, however, in the way in which it is the object of the blessed, but as containing the types [Cf. I, 15] of future events. But this is altogether impossible. For God is the object of bliss in His very essence, according to the saying of Augustine (Confess. v, 4): "Happy whoso knoweth Thee, though he know not these," i.e. creatures. Now it is not possible to see the types of creatures in the very essence of God without seeing It, both because the Divine essence is Itself the type of all things that are made--the ideal type adding nothing to the Divine essence save only a relationship to the creature--and because knowledge of a thing in itself--and such is the knowledge of God as the object of heavenly bliss--precedes knowledge of that thing in its relation to something else--and such is the knowledge of God as containing the types of things. Consequently it is impossible for prophets to see God as containing the types of creatures, and yet not as the object of bliss. Therefore we must conclude that the prophetic vision is not the vision of the very essence of God, and that the prophets do not see in the Divine essence Itself the things they do see, but that they see them in certain images, according as they are enlightened by the Divine light.

Wherefore Dionysius (Coel. Hier. iv), in speaking of prophetic visions, says that "the wise theologian calls that vision divine which is effected by images of things lacking a bodily form through the seer being rapt in divine things." And these images illumined by the Divine light have more of the nature of a mirror than the Divine essence: since in a mirror images are formed from other things, and this cannot be said of God. Yet the prophet's mind thus enlightened may be called a mirror, in so far as a likeness of the truth of the Divine foreknowledge is formed therein, for which reason it is called the "mirror of eternity," as representing God's foreknowledge, for God in His eternity sees all things as present before Him, as stated above (Question 172, Article 1).

[II-II.q.173.a.1.ad.1] The prophets are said to read the book of God's foreknowledge, inasmuch as the truth is reflected from God's foreknowledge on the prophet's mind.

[II-II.q.173.a.1.ad.2] Man is said to see in the First Truth the type of his existence, in so far as the image of the First Truth shines forth on man's mind, so that he is able to know himself.

[II-II.q.173.a.1.ad.3] From the very fact that future contingencies are in God according to unalterable truth, it follows that God can impress a like knowledge on the prophet's mind without the prophet seeing God in His essence.

[II-II.q.173.a.2.arg.2] Further, according to Augustine (Gen. ad lit. xii, 9), "it is not imaginative but intellective vision that makes the prophet"; wherefore it is declared (Daniel 10:1) that "there is need of understanding in a vision." Now intellective vision, as stated in the same book (Gen. ad lit. xii, 6) is not effected by means of images, but by the very truth of things. Therefore it would seem that prophetic revelation is not effected by impressing species on the soul.

[II-II.q.173.a.2.arg.3] Further, by the gift of prophecy the Holy Ghost endows man with something that surpasses the faculty of nature. Now man can by his natural faculties form all kinds of species of things. Therefore it would seem that in prophetic revelation no new species of things are impressed, but merely an intellectual light.

[II-II.q.173.a.2.sc] It is written (Hosea 12:10): "I have multiplied" their "visions, and I have used similitudes, by the ministry of the prophets." Now multiplicity of visions results, not from a diversity of intellectual light, which is common to every prophetic vision, but from a diversity of species, whence similitudes also result. Therefore it seems that in prophetic revelation new species of things are impressed, and not merely an intellectual light.

[II-II.q.173.a.2.co] As Augustine says (Gen. ad lit. xii, 9), "prophetic knowledge pertains most of all to the intellect." Now two things have to be considered in connection with the knowledge possessed by the human mind, namely the acceptance or representation of things, and the judgment of the things represented. Now things are represented to the human mind under the form of species: and according to the order of nature, they must be represented first to the senses, secondly to the imagination, thirdly to the passive intellect, and these are changed by the species derived from the phantasms, which change results from the enlightening action of the active intellect. Now in the imagination there are the forms of sensible things not only as received from the senses, but also transformed in various ways, either on account of some bodily transformation (as in the case of people who are asleep or out of their senses), or through the coordination of the phantasms, at the command of reason, for the purpose of understanding something. For just as the various arrangements of the letters of the alphabet convey various ideas to the understanding, so the various coordinations of the phantasms produce various intelligible species of the intellect.

As to the judgment formed by the human mind, it depends on the power of the intellectual light.

Now the gift of prophecy confers on the human mind something which surpasses the natural faculty in both these respects, namely as to the judgment which depends on the inflow of intellectual light, and as to the acceptance or representation of things, which is effected by means of certain species. Human teaching may be likened to prophetic revelation in the second of these respects, but not in the first. For a man represents certain things to his disciple by signs of speech, but he cannot enlighten him inwardly as God does.

But it is the first of these two that holds the chief place in prophecy, since judgment is the complement of knowledge. Wherefore if certain things are divinely represented to any man by means of imaginary likenesses, as happened to Pharaoh (Genesis 41:1-7) and to Nabuchodonosor (Daniel 4:1-2), or even by bodily likenesses, as happened to Balthasar (Daniel 5:5), such a man is not to be considered a prophet, unless his mind be enlightened for the purpose of judgment; and such an apparition is something imperfect in the genus of prophecy. Wherefore some [Rabbi Moyses, Doct. Perplex. II, xxxvi] have called this "prophetic ecstasy," and such is divination by dreams. And yet a man will be a prophet, if his intellect be enlightened merely for the purpose of judging of things seen in imagination by others, as in the case of Joseph who interpreted Pharaoh's dream. But, as Augustine says (Gen. ad lit. xii, 9), "especially is he a prophet who excels in both respects, so," to wit, "as to see in spirit likenesses significant of things corporeal, and understand them by the quickness of his intellect."

Now sensible forms are divinely presented to the prophet's mind, sometimes externally by means of the senses--thus Daniel saw the writing on the wall (Daniel 5:25)--sometimes by means of imaginary forms, either of exclusively Divine origin and not received through the senses (for instance, if images of colors were imprinted on the imagination of one blind from birth), or divinely coordinated from those derived from the senses--thus Jeremiah saw the "boiling caldron . . . from the face of the north" (Jeremiah 1:13)--or by the direct impression of intelligible species on the mind, as in the case of those who receive infused scientific knowledge or wisdom, such as Solomon or the apostles.

But intellectual light is divinely imprinted on the human mind--sometimes for the purpose of judging of things seen by others, as in the case of Joseph, quoted above, and of the apostles whose understanding our Lord opened "that they might understand the scriptures" (Luke 24:45); and to this pertains the "interpretation of speeches"--sometimes for the purpose of judging according to Divine truth, of the things which a man apprehends in the ordinary course of nature--sometimes for the purpose of discerning truthfully and efficaciously what is to be done, according to Isaiah 63:14, "The Spirit of the Lord was their leader."

Hence it is evident that prophetic revelation is conveyed sometimes by the mere infusion of light, sometimes by imprinting species anew, or by a new coordination of species.

[II-II.q.173.a.2.ad.1] As stated above, sometimes in prophetic revelation imaginary species previously derived from the senses are divinely coordinated so as to accord with the truth to be revealed, and then previous experience is operative in the production of the images, but not when they are impressed on the mind wholly from without.

[II-II.q.173.a.2.ad.2] Intellectual vision is not effected by means of bodily and individual images, but by an intelligible image. Hence Augustine says (De Trin. ix, 11) that "the soul possesses a certain likeness of the species known to it." Sometimes this intelligible image is, in prophetic revelation, imprinted immediately by God, sometimes it results from pictures in the imagination, by the aid of the prophetic light, since a deeper truth is gathered from these pictures in the imagination by means of the enlightenment of the higher light.

[II-II.q.173.a.2.ad.3] It is true that man is able by his natural powers to form all kinds of pictures in the imagination, by simply considering these pictures, but not so that they be directed to the representation of intelligible truths that surpass his intellect, since for this purpose he needs the assistance of a supernatural light.

[II-II.q.173.a.4.arg.1] It would seem that the prophets always know the things which they prophesy. For, as Augustine says (Gen. ad lit. xii, 9), "those to whom signs were shown in spirit by means of the likenesses of bodily things, had not the gift of prophecy, unless the mind was brought into action, so that those signs were also understood by them." Now what is understood cannot be unknown. Therefore the prophet is not ignorant of what he prophesies.

[II-II.q.173.a.4.arg.2] Further, the light of prophecy surpasses the light of natural reason. Now one who possesses a science by his natural light, is not ignorant of his scientific acquirements. Therefore he who utters things by the prophetic light cannot ignore them.

[II-II.q.173.a.4.arg.3] Further, prophecy is directed for man's enlightenment; wherefore it is written (2 Peter 1:19): "We have the more firm prophetical word, whereunto you do well to attend, as to a light that shineth in a dark place." Now nothing can enlighten others unless it be lightsome in itself. Therefore it would seem that the prophet is first enlightened so as to know what he declares to others.

[II-II.q.173.a.4.sc] It is written (John 11:51): "And this he" (Caiphas) "spoke, not of himself, but being the High Priest of that year, he prophesied that Jesus should die for the nation," etc. Now Caiphas knew this not. Therefore not every prophet knows what he prophesies.

[II-II.q.173.a.4.co] In prophetic revelation the prophet's mind is moved by the Holy Ghost, as an instrument that is deficient in regard to the principal agent. Now the prophet's mind is moved not only to apprehend something, but also to speak or to do something; sometimes indeed to all these three together, sometimes to two, sometimes to one only, and in each case there may be a defect in the prophet's knowledge. For when the prophet's mind is moved to think or apprehend a thing, sometimes he is led merely to apprehend that thing, and sometimes he is further led to know that it is divinely revealed to him.

Again, sometimes the prophet's mind is moved to speak something, so that he understands what the Holy Ghost means by the words he utters; like David who said (2 Samuel 23:2): "The Spirit of the Lord hath spoken by me"; while, on the other hand, sometimes the person whose mind is moved to utter certain words knows not what the Holy Ghost means by them, as was the case with Caiphas (John 11:51).

Again, when the Holy Ghost moves a man's mind to do something, sometimes the latter understands the meaning of it, like Jeremias who hid his loin-cloth in the Euphrates (Jeremiah 13:1-11); while sometimes he does not understand it--thus the soldiers, who divided Christ's garments, understood not the meaning of what they did.

Accordingly, when a man knows that he is being moved by the Holy Ghost to think something, or signify something by word or deed, this belongs properly to prophecy; whereas when he is moved, without his knowing it, this is not perfect prophecy, but a prophetic instinct. Nevertheless it must be observed that since the prophet's mind is a defective instrument, as stated above, even true prophets know not all that the Holy Ghost means by the things they see, or speak, or even do.

And this suffices for the Replies to the Objections, since the arguments given at the beginning refer to true prophets whose minds are perfectly enlightened from above.

The Summa Theologica of St. Thomas AquinasSecond and Revised Edition, 1920Literally translated by Fathers of the English Dominican ProvinceOnline Edition Copyright © 2009 by Kevin Knight Nihil Obstat. F. Innocentius Apap, O.P., S.T.M., Censor. Theol.Imprimatur. Edus. Canonicus Surmont, Vicarius Generalis. Westmonasterii.APPROBATIO ORDINISNihil Obstat. F. Raphael Moss, O.P., S.T.L. and F. Leo Moore, O.P., S.T.L.Imprimatur. F. Beda Jarrett, O.P., S.T.L., A.M., Prior Provincialis AngliæMARIÆ IMMACULATÆ - SEDI SAPIENTIÆ