When the Lord shall build up Zion,.... The church of God, fallen down, and in a ruinous condition, as it may be said to be when the doctrines of the Gospel are departed from; the ordinances of it are corrupted and altered, or not attended to; the worship and discipline of the Lord's house are neglected; great declensions in faith, love, and zeal, among the professors of religion, and but few instances of conversion: and it may be said to be built up again, as it will be in the latter day, when the doctrines of grace will be revived; the ordinances will be administered in their primitive purity; great spirituality, holiness, and brotherly love, among the saints, and large numbers converted and brought into it: and this will be the work of Christ, the great master builder; the materials of this building are the saints, those lively stones which will now be laid with fair colours; the ministers of the word will be the instruments that Christ will make use of in rebuilding his church; it is his Spirit, power, and grace, which will make all effectual; and he will have the glory, as follows: the Targum is, "for the city of Zion is built by the Word of the Lord:'' he shall appear in his glory; or "shall be seen in his glory" (b), which will be upon his church and people, and on which there will be a defence, so that it shall continue; and this will lie chiefly in the purity of Gospel truths, ordinances, and worship; in the number of converts; in the gifts and graces of the Spirit of God upon them; in their peace, prosperity, unity, and spirituality; and in the presence of Christ with them, who will be seen in all the glory and majesty of his kingly office; he will now reign before his ancients gloriously. (b) "videbitur", V. L. Pagninus, Montanus.