John Calvin Commentary Isaiah 45:6

"that they may know from the rising of the sun, and from the west, that there is none besides me: I am Jehovah, and there is none else." — Isaiah 45:6 (ASV)

Therefore they shall know. He means that this favor shall be so remarkable as to be acknowledged and admired by all nations. This was not indeed immediately fulfilled; for, although the fame of that victory was spread far and wide, yet few understood that the God of Israel was its author; but it was immediately made known to the neighbors, and was communicated from one nation to another, until the report of it was spread throughout the whole world.

He does not predict what will happen immediately, but what will happen later, though these things were long concealed. God therefore did not permit the remembrance of this transaction to fade away, but determined that it should be handed down in permanent records, that it might be celebrated in all ages, and by the most distant nations, to the very end of the world.

We must therefore remember what I previously remarked: that the Prophet interweaves earlier and later events, because the return of the people was the prelude to a future redemption, and that he thus speaks of a perfect restoration of the Church. Besides, when it happens that the illustrious works of God are buried by the ingratitude and malice of people, it nevertheless remains true that they shall be visible to the whole world; for they shine openly and brightly, though the blind do not see them.