Comfort
The first two verses of Isaiah 40 (Isaiah 40:1-2) give the key-note of the second part of the prophecy of Isaiah. The great theme of this section is Jesus Christ in His sufferings, and the glory that shall follow in the Davidic kingdom. (See "Christ in Old Testament," sufferings,) (Genesis 4:4); (Hebrews 10:18) glory, (2 Samuel 7:8-15); (Zechariah 12:8) Since Israel is to be regathered, converted, and made the centre of the new social order when the kingdom is set up, this part of Isaiah appropriately contains glowing prophecies concerning these events. The full view of the redemptive sufferings of Christ (for example Isaiah 53) leads to the evangelic strain so prominent in this part of (Isaiah 55:1-3).
The change in style, about which so much has been said, is no more remarkable than the change of theme. A prophet who was also a patriot would not write of the sins and coming captivity of his people in the same exultant and joyous style which he would use to describe their redemption, blessing, and power. In (John 12:37-44) quotations from Isaiah 53 and 6 are both ascribed to Isaiah.