“The sacrament of the Eucharist—like the sacrament of Reconciliation—was entrusted by Christ to the Apostles and has been passed down by them and their successors in every generation. At the beginning of his public life, the Messiah called the Twelve, appointed them “to be with him” and sent them out on mission (cf. Mk 3:14-15). At the Last Supper, this “being with” Jesus on the part of the Apostles reached its culmination. By celebrating the Passover meal and instituting the Eucharist, the divine Master brought their vocation to its fulfilment. By saying “Do this in memory of me”, he put a Eucharistic seal on their mission and, by uniting them to himself in sacramental communion, he charged them to perpetuate that most holy act in his memory.”
LETTER OF THE HOLY FATHER POPE JOHN PAUL II TO PRIESTS FOR HOLY THURSDAY 2004