Daniel 2:40

40 and a fourth kingdom, which shall be strong as iron: as iron beats to powder and subdues all things, so shall it beat to powder and subdue.

Daniel 2:40 Meaning and Commentary

Daniel 2:40

And the fourth kingdom shall be strong as iron
This is not the kingdom of the Lagidae and Seleucidae, the successors of Alexander, as some have thought; for these are designed by the thighs in the third kingdom; and, besides, the kingdom of Christ was to arise in the time of this fourth kingdom, which it did not in that; nor the kingdom of Gog, or the empire of the Turks, as Saadiah, Aben Ezra, and Jarchi; but the Roman empire, which is compared to iron for its strength, firmness, and duration in itself; and for its power over other nations; and also for its cruelty to the Jews above all others, in utterly destroying their city, temple, and nation: forasmuch as iron breaketh in pieces and subdueth all things;
so this kingdom has subdued and conquered all others; not the Jews only, but the Persians, Egyptians, Syrians, Africans, French, Germans, yea, all the world: and as iron that breaketh,
or "even as iron breaketh all these", shall it break in pieces, and bruise;
all nations and kingdoms; hence Rome has been called the mistress of the world, and its empire in Scripture is called the whole world, ( Luke 2:1 ) ( Revelation 17:18 ) .

Daniel 2:40 In-Context

38 in every place where the children of men dwell: and he has given into thine hand the wild beasts of the field, and the birds of the sky and the fish of the sea, and he has made thee lord of all.
39 Thou art the head of gold. And after thee shall arise another kingdom inferior to thee, an a third kingdom which is the brass, which shall have dominion over all the earth;
40 and a fourth kingdom, which shall be strong as iron: as iron beats to powder and subdues all things, so shall it beat to powder and subdue.
41 And whereas thou sawest the feet and the toes, part of earthenware and part of iron, the kingdom shall be divided; yet there shall be in it of the strength of iron, as thou sawest the iron mixed with earthenware.
42 And the toes of the feet were part of iron and part of earthenware, part of the kingdom shall be strong, and of it shall be broken.

The Brenton translation of the Septuagint is in the public domain.