The sacrament of the Eucharist defines God's people as those who share in the sufferings of Jesus and also share in the reconciliation that Jesus provides between God and humanity. There is much reason to rejoice together, because the Body and Blood of Jesus remind us of how powerfully God can employ the suffering of faithful people to heal the world.
The world intends much of what it does for evil, but God intends it for good, having, as God does authority over all creation, even the consequences of our sins. We rejoice because God is sovereign, even over evil, and full of love for us.
We are to be reminded by eating and drinking the body and blood of Jesus that He is literally still with us and is still in us, just as He promised so long ago.

On the rear panel of the altar is the text "Now the Feast and Celebration", which is intended to remind all who administer the sacrament that it is meant as a time of grateful celebration for what God has done with "sin, death and the power of the devil", having destroyed them through Jesus who died for our sins, rose from the grave and now lives with the Father and the Holy Spirit forever.