Commentaries
45:1-4 Cyrus is called God's anointed; he was designed and qualified for his great service by the counsel of God. The gates of Babylon which led to the river, were left open the night that Cyrus marched his army into the empty channel. The Lord went before him, giving entrance to the cities he besieged. He gave him also treasures, which had been hidden in secret places. The true God was to Cyrus an unknown God; yet God foreknew him; he called him by his name. The exact fulfilment of this must have shown Cyrus that Jehovah was the only true God, and that it was for the sake of Israel that he was prospered. In all the changes of states and kingdoms, God works out the good of his church.
3. treasures of darkness—that is, hidden in subterranean places; a common Oriental practice. Sorcerers pretended to be able to show where such treasures were to be found; in opposition to their pretensions, God says, He will really give hidden treasures to Cyrus (Jer 50:37; 51:13). Pliny (Natural History,, 33:3) says that Cyrus obtained from the conquest of Asia thirty-four thousand pounds weight of gold, besides golden vases, and five hundred thousand talents of silver, and the goblet of Semiramis, weighing fifteen talents.
that thou mayest know—namely, not merely that He was "the God of Israel," but that He was Jehovah, the true God. Ezr 1:1, 2 shows that the correspondence of the event with the prediction had the desired effect on Cyrus.
which call … thy name—so long before designate thee by name (Isa 43:1).