Ps 125:1

“"When the Lord turned back the captivity of Sion, we became as those that are comforted" [Psalm 126:1]. He meant by this to say, we became joyful. When? "When the Lord turned back the captivity of Sion." What is Sion? Jerusalem, the same is also the eternal Sion. How is Sion eternal, how is Sion captive? In angels eternal, in men captive. For not all the citizens of that city are captives, but those who are away from thence, they are captives. Man was a citizen of Jerusalem, but sold under sin he became a pilgrim. Of his progeny was born the human race, and the captivity of Sion filled all lands. And how is this captivity of Sion a shadow of that Jerusalem? The shadow of that Sion, which was granted to the Jews, in an image, in a figure, was in captivity in Babylonia, and after seventy years that people turned back to its own city.. ..But when all time is past, then we return to our country, as after seventy years that people returned from the Babylonish captivity, for Babylon is this world; since Babylon is interpreted "confusion."...So then this whole life of human affairs is confusion, which belongs not unto God. In this confusion, in this Babylonish land, Sion is held captive. But "the Lord has turned back the captivity of Sion." "And we became," he says, "as those that are comforted." That is, we rejoiced as receiving consolation. Consolation is not save for the unhappy, consolation is not save for them that groan, that mourn. Wherefore, "as those that are comforted," except because we are still mourning? We mourn for our present lot, we are comforted in hope: when the present is passed by, of our mourning will come everlasting joy, when there will be no need of consolation, because we shall be wounded with no distress. But wherefore says he "as" those that are comforted, and says not comforted? This word "as," is not always put for likeness: when we say "As," it sometimes refers to the actual case, sometimes to likeness: here it is with reference to the actual case....Walk therefore in Christ, and sing rejoicing, sing as one that is comforted; because He went before you who has commanded you to follow Him.”