III. Yet another voice, whether sounding from heaven or earth is as uncertain as is the person to whom it is addressed, authoritatively commands a third to 'cry,' and, on being asked what is to be the burden of the call, answers. This new herald is to proclaim man's frailty and the immortal vigour of God's word, which secures the fulfilment of His promises. Is it the questioning voice, or the commanding one, which says, 'All flesh is grass,... the people is grass'? If the former, it is the utterance of hopelessness, all but refusing the commission. But, dramatic as that construction is, it seems better to regard the whole as the answer to the question, 'What shall I cry?' The repetition of the theme of man's frailty is not unnatural, and gives emphasis to the contrast of the unchangeable stability of God's word. An hour of the deadly hot wind will scorch the pastures, and all the petals of the flowers among the herbage will fall. So everything lovely, bright, and vigorous in humanity wilts and dies. One thing alone remains fresh from age to age,--the uttered will of Jehovah. His breath kills and makes alive. It withers the creatural, and it speaks the undying word. This message is to follow those others which tell of God's merciful promises, that trembling hearts may not falter when they see all created stays sharing the common lot, but may rest assured that God's promises are as good as God's facts, and so may hope when all things visible would preach despair. It was given to hearten confidence in the prophecy of a future revelation of the glory of God. It remains with us to hearten confidence in a past revelation, which will stand unshaken, whatever forces war against it. Its foes and its friends are alike short-lived as the summer's grass. The defences of the one and the attacks of the other are being antiquated while being spoken; but the bare word of God, the record of the incarnate Word, who is the true revelation of the glory of God, will stand for ever,--'And this is the Word which by the gospel is preached to you.' IV. The prophet seems to be the speaker in verses 9-11, or perhaps the same anonymous voice which already commanded the previous message summons Jerusalem to become the ambassadress of her God. The coming of the Lord is conceived as having taken place, and He is enthroned in Zion. The construction which takes Jerusalem or Zion (the double name so characteristic of the second part of Isaiah) to be the recipient of the good tidings is much less natural than that which regards her as their bearer.