Charles H. Spurgeon on Psalms 122:6

They shall prosper that love thee. The word "prosper" conveys an idea which is not in the original. The Hebrew word means to be secure, tranquil, at rest, spoken especially of one who enjoys quiet prosperity: Job 3:26 12:6. The essential idea is that of quietness or rest; and the meaning here is, that those who love Zion will have peace; or, that the tendency of that love is to produce peace. See Ro 5:1. The prayer was for "peace"; the thought in connexion with that was naturally that those who loved Zion would have peace. It is indeed true, in general, that they who love Zion, or who serve God, will "prosper"; but that is not the truth taught here. The idea is that they will have peace: —peace with God; peace in their own consciences; peace in the prospect of death and of the future world; peace amidst the storms and tempests of life; peace in death, in the grave, and for ever. Albert Barnes.