But our wonder should be far greater when we find that in obedience to the words of his priests - HOC EST CORPUS MEUM - God himself descends on the altar, that he comes wherever they call him and as often as they call him, and places himself in their hands, even though they should be be his enemies. And after having come, he remains, entirely at their disposal they move him as they please, from one place to another, they may, if they wish, shut him up in the tabernacle, expose him on the altar, or carry him outside the church; they may, if they choose, eat his flesh, and give him for the food of others. "Oh, how very great is their power," says St. Lawrence Justinian, speaking of priests. "A word falls from their lips and the body of Christ is there substantially formed from the matter of bread, and the Incarnate Word descended from heaven, is found really present on the table of the altar! Never did divine goodness give such power to the angels. The angels abide by the order of God, but the priests take him in their hands, distribute him to the faithful, and partake of him as food for themselves."
Thus the priest may, in a certain manner, be called the creator of his Creator, ...
"The power of the priest," says St. Bernadine of Sienna, "is the power of the divine person; for the transubstantiation of the bread requires as much power as the creation of the world."
As the Word of God created heaven and earth, so, says St. Jerome, the words of the priest create Jesus Christ.
The Dignity and Duties of the Priest , by St. Alphonsus de Liguori