HKB
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 (Q. 172, A. 1).
Reply Obj. 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.
Reply Obj. 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.
Reply Obj. 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.
SECOND ARTICLE [II-II, Q. 173, Art. 2]
Whether, in Prophetic Revelation, New Species of Things Are Impressed on the Prophet's Mind, or Merely a New Light?
Objection 1: It would seem that in prophetic revelation no new species of things are impressed on the prophet's mind, but only a new light. For a gloss of Jerome on Amos 1:2 says that "prophets draw comparisons from things with which they are conversant." But if prophetic vision were effected by means of species newly impressed, the prophet's previous experience of things would be inoperative. Therefore no new species are impressed on the prophet's soul, but only the prophetic light.
Obj. 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 (Dan. 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.
Obj. 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.
On the contrary, It is written (Osee 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.