(David asked them)...to play loudly and lift up their voices with joy. 1 Chr 15:16

Psalm 71:23
My lips shall shout for joy when I sing praises to You, and my inner being, which You have redeemed.

God's presence has always been reason enough to be joyful, even in affliction and pain. Joyful service is our due, kind of, the one thing we can truly give. One thing, that may make a difference to this world. What a joy that would be, to be glad again.

Acts 13:52
And the disciples were continually filled with joy and the Holy Spirit.