"Christ has died. Christ is risen. Christ will come again in glory. These words contain the very essence of the Eucharistic mystery. In them we find what we bear witness to and share in every day as we celebrate and receive the Eucharist. In the Upper Room Jesus effects the consecration. By virtue of His words, the bread - while keeping the external appearance of bread - becomes His Body, and the wine - while maintaining the external appearance of wine - becomes His Blood. THIS IS THE GREAT MYSTERY OF FAITH! THIS IS THE LIVING BREAD WHICH CAME DOWN FROM HEAVEN!"

(Pope John Paul II)