_There_ is a lesson for us, brethren, in times of fluctuation, of change of opinion, of shaking of institutions, and of new social, economical, and political questions, threatening day by day to reorganise society. 'We have a strong city'; and whatever may come--and much destructive will come, and much that is venerable and antique, rooted in men's prejudices, and having survived through and oppressed the centuries, will have to go; but God's polity, His form of human society of which the perfect ideal and antitype, so to speak, lies concealed in the heavens, is everlasting. Therefore, whatsoever changes, whatsoever ancient and venerable things come to be regarded as of no account, howsoever the nations, like clay in the hands of the potter, may have to assume new forms, as certainly they will, yet the foundation of God standeth sure. And for Christian men in revolutionary epochs, whether these revolutions affect the forms in which truth is grasped, or whether they affect the moulds into which society is run, the only worthy temper is the calm, triumphant expectation that through all the dust, contradiction, and distraction, the fair city of God will be brought nearer and made more manifest to man. Isaiah, or whoever was the writer of these great words of my text, stayed his own and his people's hearts in a time of confusion and distress, by the thought that it was only Babylon that could fall, and that Jerusalem was the possessor of a charmed, immortal life. This strong city, the order of human society which God has appointed, and which exists, though it be hidden in the heavens, will be manifested one day when, like the fair vision of the goddess rising from amidst the ocean's foam, and shedding peace and beauty over the charmed waves, there will emerge from all the wild confusion and tossing billows of the sea of the peoples the fair form of the 'Bride, the Lamb's wife.' There shall be an apocalypse of the city, and whether the old words which catch up the spirit of my text, and speak of that Holy City as 'descending from heaven' upon earth, at the close of the history of the world, are to be taken, as perhaps they are, as expressive of the truth that a renewed earth is to be the dwelling of the ransomed or no, this at least is clear, that the city shall be revealed, and when Babylon is swept away, Zion shall stand.