The psalmist recounts how the Israelites were filled with joy when God restored their fortunes after their exile in Babylon. They could not believe their good fortune, as it seemed like a dream. Their laughter and songs of joy spread among the nations, who acknowledged that God had done great things for his people. The psalmist prays that God will continue to restore their fortunes, just as streams fill with water in the desert, so that those who sow in tears may once again reap with cries of joy.