The song is a reminder of our faith in the Lord, reassurance and promises from the Lord to celebrate and rejoice in the Lord.. No matter what we are going through,, our hearts should seek the Lord and rejoice. He promised us that HE will turn our mourning into joy, comfort us and give us gladness for sorrow. !!!! Hallelujah!!!! Glory be to GOD
Jeremiah 31:13—-Then shall the young women rejoice in the dance, and the young men and the old shall be merry. I will turn their mourning into joy; I will comfort them, and give them gladness for sorrow.

Psalm 66:6— He turned the sea into dry land, they passed through the waters on foot— come, let us rejoice in him.
1 Peter 1:8—Though you have not seen him, you love him. Though you do not now see him, you believe in him and rejoice with joy that is inexpressible and filled with glory, Joel 2:23–Be glad, O children of Zion, and rejoice in the LORD your God, for he has given the early rain for your vindication; he has poured down for you abundant rain, the early and the latter rain, as before.

Luke 13:17—As he said these things, all his adversaries were put to shame, and all the people rejoiced at all the glorious things that were done by him. Romans 12:12—Rejoice in hope, be patient in tribulation, be constant in prayer. 2 Corinthians 7:16—I rejoice, because I have complete confidence in you.