The voice of rejoicing and salvation is in the tabernacles of the righteous: the right hand of the LORD does valiantly.
Read Chapter 118
Augustine of Hippo
AD 430
9. "The voice of joy and health is in the dwellings of the righteous" (ver. 15); where they who raged against their bodies thought there was the voice of sorrow and destruction. For they did not know the inward joy of the saints in their future hope. Whence the Apostle also saith, "As sorrowful, yet alway rejoicing;" and again, "And not only so, but we glory in tribulations also."
Just. Such were the Jews by their vocation, though many answered very ill the designs of God. (Calmet)
Christians thank God for their redemption, and confessors are full of joy in their prisons and torments, Acts xvi. 25. (Berthier)