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Daniel 7:7

After this I saw in the night visions, and behold a fourth beast, dreadful and terrible, and strong exceedingly; and it had great iron teeth: it devoured and broke in pieces, and stamped the residue with its feet: and it was diverse from all the beasts that were before it; and it had ten horns.
All Commentaries on Daniel 7:7 Go To Daniel 7

Jerome

AD 420
The fourth empire is the Roman Empire, which now occupies the entire world, and concerning which it was said in connection with the image, "Its lower legs were of iron, and part of its feet were of iron, and part of clay." And yet from the iron |76 portion itself Daniel calls to mind that its teeth were iron, and solemnly avers that they were large in size. I find it strange that although he had set forth a lioness, a bear and a leopard in the case of the three previous kingdoms, he did not compare the Roman realm to any sort of beast. Perhaps it was in order to render the beast fearsome indeed that he gave it no name, intending thereby that we should understand the Romans to partake of all the more ferocious characteristics we might think of in connection with beasts. The Hebrews believe that the beast which is here not named is the one spoken of in the Psalms: "A boar from the forest laid her waste, and a strange wild animal consumed her" (Ps. 79:14). [This is the citation according to the Septuagint and Vulgate, whose translation of the Septuagint is here quoted; but the citation in the Hebrew text is Ps. 80:14, and in the English Version, 80:13.] Instead of this the Hebrew reads: "All the beasts of the field have torn her." [A more accurate rendering of the Hebrew would be: ". . .and the moving creatures (or "swarms") of the field do feed upon her."] While they are all included in the one Empire of the Romans, we recognize at the same time those kingdoms which were previously separate. And as for the next statement, ". . .devouring and crushing, and pounding all the rest to pieces under his feet," this signifies that all nations have either been slain by the Romans or else have been subjected to tribute and servitude.
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Knowing this first, that no prophecy of the scripture is of any private interpretation - 2 Peter 1:20

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