Jesus instituted the Holy Eucharist at the Last Supper. When he said, "This is my body" and "This is the chalice of my blood," he meant exactly that ~ "is" means "is" and we are to believe and not try to figure out how it possibly could be. This is a mystery as all the other mysteries about God. The Holy Eucharist is the bread from heaven, in which the Lord is truly present. What you receive at Mass is exactly what the Apostles received at the Last Supper. In receiving this sacrament, you welcome God into you, acknowledging yourself as his child, and the love between you and him is sealed, so to speak. Appreciating this physical union will take you all the way to full spiritual union with the Lord. No wonder this great gift is the center of worship in his Church from the very beginning. Loving the Holy Eucharist is loving Christ and his Church.