I. He sees, in a vision, a man going to measure Jerusalem (v. 1, 2): He lifted up his eyes again, and looked. God had shown him that which was very encouraging to him, (ch. i. 20), and therefore now he lifted up his eyes again and looked. Note, The comfortable sights which by faith we have had of God's goodness made to pass before us should engage us to lift up our eyes again, and to search further into the discoveries made to us of the divine grace; for there is still more to be seen. In the close of the foregoing chapter he had seen Jerusalem's enemies baffled and broken, so that now he begins to hope she shall not be ruined. But that is not enough to make her happy, and therefore that is not all that is promised. Here is more carpenter's work to be done. When David had resolved to cut off the horns of the wicked he engaged likewise that the horns of the righteous should be exalted, Ps. lxxv. 10. And so does the Son of David here; for he is the man, even the man Christ Jesus, whom the prophet sees with a measuring line in his hand; for he is the master builder of his church (Heb. iii. 3), and he builds exactly by line and level. Zechariah took the boldness to ask him whither he was going and what he designed to do with that measuring line. And he readily told him that he was going to measure Jerusalem, to take a particular account of the dimensions of it each way, that it might be computed what was necessary for the making of a wall about it, and that it might appear, by comparing its dimensions with the vast numbers that should inhabit it, what additions were necessary to be made for the receiving and containing of them; when multitudes flock to Jerusalem (Isa. lx. 4) it is time for her to enlarge the place of her tent, Isa. liv. 2. Note, God takes notice of the extent of his church, and will take care that, when ever so many guests are brought in to the wedding supper, still there shall be room, Luke xiv. 22. In the New Jerusalem, my Father's house above, there are many mansions.