Charles H. Spurgeon on Psalms 128:5

Thou shalt see the good of Jerusalem, etc. What is added concerning "the good of Jerusalem" is to be regarded as enjoining upon the godly the duty not only of seeking their own individual welfare, or of being devoted to their own peculiar interests; but rather of having it as their chief desire to see the Church of God in a flourishing condition. It would be a very unreasonable thing for each member to desire what may be profitable for itself, while in the meantime the body was neglected. From our extreme proneness to err in this respect, the prophet, with good reason, recommends solicitude about the public welfare; and lie mingles together domestic blessings and the common benefits of the church in such a way as to show us that they are things joined together, and which it is unlawful to put asunder. —John Calvin.