It’s sometimes easier for us to understand the Eucharist as “sacred meal” rather than “sacrifice.” Few of us are as familiar as the early Jews with the idea of sacrifice. But Christianity calls us to routinely sacrifice, to take some aspect of creation and return it to God as a sign of our thanksgiving, communion, or atonement. It’s only through this lens of sacrifice that we can begin to understand what Jesus is doing the night before his death. He institutes the Eucharist to become a re-presentation of his great sacrifice on the Cross, his body offered and his blood outpoured, by which we are reconciled with God. That’s what this Feast of Corpus Christi is finally about.
Source: Jesus’ Sacrifice | Word on Fire