Isaiah 48:6

God directed His people to consider carefully what He had just revealed, and they would have to admit that it was true. It was important that they come to a clear understanding of His ways because He was making other predictions about the future (i.e., Cyrus, return from exile, the coming Servant). They needed to know that He is in charge and that He is dependable. What He revealed was hidden, in that its time and method of fulfillment were not specific, but the content itself was clear enough, having been revealed generally before (cf. Genesis 15:18-21; Deuteronomy 30:1-5).