'In that day shall this song be sung in the land of Judah; We have a strong city; salvation will God appoint for walls and bulwarks. Open ye the gates, that the righteous nation which keepeth the truth may enter in.'--ISAIAH xxvi 1-2.
What day is 'that day'? The answer carries us back a couple of chapters, to the great picture drawn by the prophet of a world-wide judgment, which is followed by a burst of song from the ransomed people of Jehovah, like Miriam's chant by the shores of the Red Sea. The 'city of confusion,' the centre of the power hostile to God and man, falls; and its fall is welcomed by a chorus of praises. The words of my text are the beginning of one of these songs. Whether or not there were any historical event which floated before the prophet's mind is wholly uncertain. If there were a smaller judgment upon some city of the enemy, it passes in his view into a world-wide judgment; and my text is purely ideal, imaginative, and apocalyptic. Its nearest ally is the similar vision of the Book of the Revelation, where, when Babylon sank with a splash like a millstone in the stream, the ransomed people raised their praises.
So, then, whatever may have been the immediate horizon of the prophet, and though, there may have stood on it some historical event, the city which he sees falling is other than any material Babylon, and the strong city in which he rejoices is other than the material Jerusalem, though it may have suggested the metaphor of my text. The song fits our lips quite as closely as it did the lips from which it first sprang, thrilling with triumph: 'We have a strong city; salvation will God appoint for walls and bulwarks. Open ye the gates, that the righteous nation which keepeth the truth may enter in.'
There are three things, then, here: the city, its defences, its citizens.
I. The City.
Now, no doubt the prophet was thinking of the literal Jerusalem; but the city is ideal, as is shown by the bulwarks which defend, and by the qualifications which permit entrance. And so we must pass beyond the literalities of Palestine, and, as I think, must not apply the symbol to any visible institution or organisation if we are to come to the depth and greatness of the meaning of these words. No church which is organised amongst men can be the New Testament representation of this strong city. And if the explanation is to be looked for in that direction at all, it can only be the invisible aggregate of ransomed souls which is regarded as being the Zion of the prophecy.
But perhaps even that is too definite and hard. And we are rather to think of the unseen but existent order of things or polity to which men here on earth may belong, and which will one day, after shocks and convulsions that shatter all which is merely institutional and human, be manifested still more gloriously.
The central thought that was moving in the prophet's mind is that of the indestructible vitality of the true Israel, and the order which it represented, of which Jerusalem on its rock was but to him a symbol. And thus for us the lesson is that, apart altogether from the existing and visible order of things in which we dwell, there is a polity to which we may belong, for 'ye are come unto Mount Zion, the city of the living God,' and that that order is indestructible. Convulsions come, every Babylon falls, all human institutions change and pass. 'The kingdoms old' are 'cast into another mould.' But persistent through them all, and at the last, high above them all, will stand the stable polity of Heaven, '_the_ city which hath _the_ foundations.'
_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.