John Gill Bible Commentary

Mark ye well her bulwarks,.... Such as the free favour of God in Christ; which is not only as a shield, but as a bulwark to the church; his everlasting love, electing grace, the covenant of grace, with its blessings and promises, all which are more immovable than rocks and mountains; and especially the power of God, which surrounds his church, as the mountains did Jerusalem; and by which they are kept and preserved as in a garrison, Psa 125:2. Also salvation by Christ; his righteousness, sacrifice, and satisfaction, which God has appointed for walls and bulwarks, and which make the city, the church, a strong and impregnable one, Isa 26:1. Likewise the Spirit of God, and his operations and influences, which are a standard against the enemy's flood of opposition and persecution; and who being in his church and people, is greater than he that is in the world, Isa 59:19, Jo1 4:4. Some render the words, set "your hearts on her strength", as the Vulgate Latin version; that is, on Christ, who is the strength of the poor and needy in their distress; the strength of their hearts, of their lives, and of their salvation, and the security of the church. Others readier them, "set your hearts on her armies"; as the Targum is; her volunteers, her soldiers, who endure hardness as good soldiers of Christ, fight the Lord's battles, and are more than conquerors through him; and a lovely sight it is to behold them, with Christ at the head of them; see Rev 19:14; consider her palaces; for Jehovah, Father, Son, and Spirit, have their dwelling places in Zion; and here, besides apostles, prophets, evangelists, and ordinary ministers of the word, who are rulers and officers set in the first place, every saint is a prince and a king; and has a place and a name here, better than that of sons and daughters of the greatest potentate on earth; every dwelling place in Mount Zion is a palace. that ye may tell it to the generation following: that is, the beauty and glory, strength and safety of the church; and even all that is spoken of her in this psalm, as well as what follows: this is the end proposed by taking a circuit round Zion, and making the above observations on it.