Now speaking of fulfilled prophecy, God Himself used those many fulfillments to prove His very existence. Eight hundred years before Jesus Christ was born, in Isaiah 46:9-10, God used one of the greatest prophets of the Old Testament to rebuke His chosen nation for worshiping idols. And then, speaking for God, the prophet Isaiah said, 'I am God, declaring the end from the beginning...I have spoken it: I will also bring it to pass.