Introduction The Catholic Church teaches that when a priest repeats the words of Christ at the Last Supper over bread and wine that these become truly the Body and Blood of the Lord, even though the appearance of the bread and wine remain. In addition, the Catholic Church teaches that the celebration of the Eucharist renews in an unbloody manner the Sacrifice of Jesus on Calvary, forming a unity with it. How can Catholics, who in every other way appear sane, hold these outrageous beliefs that utterly defy ordinary human sense? Moreover, how can Catholics maintain, in the light of...