Do good in thy good pleasure unto Zion: build thou the walls of Jerusalem.
Ver. 18. Do good in thy good pleasure unto Sion] Having made his own peace with God, he now prayeth for the Church: and the rather, because by his foul sins he had hazarded, or rather exposed, both Zion and Jerusalem, Church and State, to divine displeasure. Delirant reges, plectuntur Achivi.
Build thou the walls of Jerusalem] i.e. Protect, defend, and maintain the civil state, grant all things necessary for its safety and well-being; supply of all wants, confirmation and increase of all blessings. Thus pray we, Jer 29:7 Psalms 122:6,8; for except the Lord keep the city, &c. See Isaiah 5:1,3; Isaiah 27:3. He is a wall of fire, Revelation 20:9, of water, Isaiah 33:20,21; say, therefore, as Isaiah 26:1, and beware of security, sensuality, senselessness, &c.