From the cross, the power of His blood flowed into the earth to make the earth his own. It is the earth which is symbolised by the host used during Holy Communion. We say, ‘This is His body.’ Symbolically, because the host is round, we are lifting up the earth and saying the earth is His body. This means that we are also being sustained by the body of Christ in the food we eat. The more that we identify ourselves with Christ, both spiritually and physically, in our eating and drinking habits, etc., the more we take the Christ within ourselves.
– from Mario Schoenmaker, The Ultimate Vision: The Revelation to John, Development Course Lecture 2, page 5.