The theologian John Macquarrie relates that the Scottish churchman, George Macleod, used to watch grain ships from Canada and the United States bringing their cargoes of wheat into Liverpool harbor, and he reflected that the wheat has the potentiality of becoming the body of Christ. This is the point at which sacramental theology spills over into the market place. Bread is not a mere commodity; things are not mere bits of matter. We can learn something of this from natural theology, but we learn it above all from Jesus Christ, the bread of God which comes down from heaven and gives life to the world.