When Yahweh brought back those who returned to Zion, we were like those who dream.
When the Lord turned again the captivity of Zion, we were like them that dream. Being in trouble, the gracious pilgrims remember for their comfort times of national woe which were succeeded by remarkable deliverances. Then sorrow was gone like a dream, and the joy which followed was so great that it seemed too good to be true, and they feared that it must be...
While the people of Israel were captives in Babylon their harps were hung upon the willow-trees, for then God called to weeping and mourning, then he mourned unto them and they lamented; but now that their captivity is turned they resume their harps; Providence pipes to them, and they dance. Thus must we accommodate ourselves to all the dispensations of Providence and be suitably affected with them.
Commenting on Psalm 126:1-3
When the LORD turned again the captivity of Zion, we were like them that dream. (a) Their deliverance was incredible and therefore took away all excuse for ingratitude.