St Paul talks about participating in the body and blood of Jesus. He does so in the context of sacrifice. The very next verses ask "are not those who eat the sacrifices partners in the altar?" He says this in relation to sacrifices to idols but it would not connect very well if He did not think of the Eucharist as a sacrifice. We need the sacrifice of Jesus on the cross to be saved. This allows us to participate in that in a very personal way.
But we have this treasure in clay jars, so that it may be made clear that this extraordinary power belongs to God and does not come from us. We are afflicted in every way, but not crushed; perplexed, but not driven to despair; persecuted, but not forsaken; struck down, but not destroyed; always carrying in the body the death of Jesus, so that the life of Jesus may also be made visible in our bodies. For while we live, we are always being given up to death for Jesus’ sake, so that the life of Jesus may be made visible in our mortal flesh. So death is at work in us, but life in you.This willingness to embrace death so that we may transmit life is at the center of how God wants us to live. Yet we don't get their first and foremost through brilliant arguments or great art. We get there through grace. It is give to us through the simplest of means. Bread to sustain life. Wine to give us joy. Transformed into a reality that can give us deeper life and more profound joy. Foolishness to those who are perishing but to those who are being saved it is the power of God (1 Cor 1:18).