Psalms 122:8

For any brethren and companions' sakes - Because this city is the abode of my kinsfolk and countrymen, I will wish it prosperity. I will promote its peace and tranquillity by all means in my power. I will affectionately say, May peace be within thee!

For my brethren and companions' sakes - Because they dwell there; or, because they go up there to worship; or, because they love thee, and find their happiness in thee; or, because they are unconverted, and all my hope of their salvation is to be derived from thee - from the church, from the influence of religion.

I will now say, Peace be within thee - I will pray for thy peace, for thy prosperity, for the blessing of God upon thee - because their good, their comfort, their hope of salvation, depends on thee - on the influence which shall go out from thee. So the Christian prays that the church may prosper - that the divine blessing may rest upon it - that there may be in it harmony, peace, love, and zeal - that a blessing may attend the preaching of the gospel - not only because he loves it, and seeks his own comfort and edification in it, but that his friends and kindred - his wife, his parents, his children, his neighbors - those whom he loves, and whose salvation he desires, may be saved. This expresses the true feelings of piety all over the world; this is one of the grounds of the strong love which the friends of God have for the church - because they hope and desire that through the church those most dear to their hearts will find salvation.