Isaiah 48:6

Thou hast heard, Israel having had plenty of opportunity to investigate. See all this, convincing themselves by personal observation; and will not ye declare it? Are men, in view of the fact that prophecy and fulfillment harmonize so perfectly, not hound to acknowledge the true God? The answer implied is that they certainly ought to agree to this if they would but speak the truth. Not only, however, has Israel sinned in this respect, but they are hardening their hearts also against further proclamations of truth. I have showed thee new things from this time, imparting this information at this time, namely, the revelation concerning the deliverance by Cyrus, even hidden things, and thou didst not know them, for the uncovering of the future is a matter pertaining to the omniscient God alone.