Charles Spurgeon Commentary Isaiah 45:2-3

"I will go before thee, and make the rough places smooth; I will break in pieces the doors of brass, and cut in sunder the bars of iron; and I will give thee the treasures of darkness, and hidden riches of secret places, that thou mayest know that it is I, Jehovah, who call thee by thy name, even the God of Israel." — Isaiah 45:2-3 (ASV)

I will go before you, and make the crooked places straight: I will break in pieces the gates of brass, and cut in sunder the bars of iron: and I will give you the treasures of darkness, and hidden riches of secret places, that you may know that I, the LORD, who call you by your name, am the God of Israel.

Whenever God calls a man to do any work, however difficult and even impossible it may seem, he will certainly accomplish it, because he will have God with him. The Lord will gird his loins, and make him strong, and all the forces of providence shall work towards the accomplishment of the divine end.

Has God given you any work to do? It may be a much easier task than that of Cyrus; so, as the Lord enabled him to succeed in his great enterprise, you may have confidence that His power is sufficient to give success to you also. It may seem presumption for you to undertake such a work; yet, if you are called of God to do it, go on without a shadow of doubt, for He will make the crooked places straight, and break in pieces the gates of brass, and cut in sunder the bars of iron.

We must not forget that, whatever God did in relation to Cyrus, was done with an eye to the welfare of his own people.