The one is external defence; the other inward illumination, with all which light symbolises—knowledge, joy, purity.
There is even more than that meant by this great promise. For notice that emphatic little word the—the glory, not a glory—in the midst of her. Now you all know what 'the glory' was. It was that symbolic Light that spoke of the special presence of God, and went with the Children of Israel in their wanderings, and sat between the Cherubim. There was no 'Shechinah,' as it is technically called, in that second Temple. But yet the Prophet says, 'The glory'—the actual presence of God—'shall be in the midst of her,' and the meaning of that great promise is taught us by the very last vision in the New Testament, in which the Seer of the Apocalypse says, 'The glory of the Lord did lighten it' (evidently quoting Zechariah), 'and the Lamb is the light thereof.' So the city is lit as by one central glow of radiance that flashes its beams into every corner, and therefore 'there shall be no night there.'
Now this promise, too, bears on churches and on individuals. On the Church as a whole it bears in this way: the only means by which a Christian community can fulfil its function, and be the light of the world, is by having the presence of God, in no metaphor, the actual presence of the illuminating Spirit in its midst. If it has not that, it may have anything and everything else—wealth, culture, learning, eloquence, influence in the world—but all is of no use; it will be darkness. We are light only in proportion as we are 'light in the Lord.' As long as we, as communities, keep our hearts in touch with Him, so long do we shine. Break the contact, and the light fades and flickers out.
The same thing is true, dear brethren, about individuals. For each of us the secret of joy, of purity, of knowledge, is that we be holding close communion with God. If we have Him in the depths of our hearts, then, and only then, shall we be 'light in the Lord.'
And now look at the last point which follows, as I have said, as the result of the other two.
III. 'Jerusalem shall be without walls.'
It is to be like the defenceless villages scattered up and down over Israel. There is no need for bulwarks of stone. The wall of fire is round about. The Prophet has a vision of a great city, of a type unknown in those old times, though familiar to us in our more peaceful days, where there was no hindrance to expansion by encircling ramparts, no crowding together of the people because they needed to hide behind the city walls; and where the growing community could spread out into the outer suburbs, and have fresh air and ample space. That is the vision of the manner of city that Jerusalem was to be. It did not come true, but the ideal was this. It has not yet come true sufficiently in regard to the churches of to-day, but it ought to be the goal to which they are tending. The more a Christian community is independent of external material supports and defences the better.
I am not going to talk about the policy or impolicy of Established Churches, as they are called. But it seems to me that the principle that is enshrined in this vision is their condemnation. Never mind about stone and lime walls, trust in God and you will not need them, and you will be strong and 'established' just in the proportion in which you are cut loose from all dependence upon, and consequent subordination to, the civil power.
But there is another thought that I might suggest, though I do not know that it is directly in the line of the Prophet's vision; and that is—a Christian Church should neither depend on, nor be cribbed and cramped by, men-made defences of any kind. Luther tells us somewhere, in his parabolic way, of people that wept because there were no visible pillars to hold up the heavens, and were afraid that the sky would fall upon their heads. No, no, there is no fear of that happening, for an unseen hand holds them up. A church that hides behind the fortifications of its grandfathers' erection has no room for expansion; and if it has no room for expansion it will not long continue as large as it is. It must either grow greater, or grow, and deserve to grow, less.
The same thing is true, dear brethren, about ourselves individually. Zechariah's prophecy was never meant to prevent what he himself helped to further, the building of the actual walls of the actual city. And our dependence upon God is not to be so construed as that we are to waive our own common-sense and our own effort. That is not faith; it is fanaticism.