Isaiah 48:4

Because I knew that thou art obstinate -I made these frequent predictions, and fulfilled them in this striking manner, because I knew that as a people, you were prone to unbelief, and in order that you might have the most full and undoubted demonstration of the truth of what was declared. As they were disinclined to credit his promises, and as he saw that in their long captivity they would be prone to disbelieve what he had said respecting their deliverance under Cyrus, he had, therefore, given them these numerous evidences of the certainty of the fulfillment of all his prophecies, in order that their minds might credit what he said about their return to their own land.