Because God alone is worthy of our trust (Isaiah 7-35), we can maintain confidence by His Word through trials (36:1-3) and temptations to put our faith in what we can see (36:4-22).
Isaiah 37:5-7
5 When the servants of King Hezekiah came to Isaiah, 6 Isaiah said to them, “Say to your master, ‘Thus says the Lord: Do not be afraid because of the words that you have heard, with which the young men of the king of Assyria have reviled me. 7 Behold, I will put a spirit in him, so that he shall hear a rumor and return to his own land, and I will make him fall by the sword in his own land.’”