'I also beseech in the Lord, all my brothers who are,
or who shall be, or who desire to be priests of the Most High, that
whenever they wish to celebrate Mass, they be pure, and offer with
purity and reverence the true Sacrifice of the most holy Body and Blood
of Our Lord Jesus Christ with a holy and perfect intention; not from any
earthly motive, nor for the fear or love of any creature, as though
desiring to please men; but let every will (according to the grace
given) be directed solely to the most High God, and do you desire to
please Him alone, for He alone works in this holy Sacrifice according to
His good pleasure, as the Lord has Himself said: "Do this in
remembrance of Me:" and he who does otherwise becomes a traitor like
Judas. Remember, O priests, my brothers, how it is written in the law of
Moses, that those who transgressed even in corporal sacrifices were
condemned by God to death, without any mercy. What a far more terrible
punishment will he deserve, who tramples under foot the Son of God, and
treats the Blood of the New Testament by which he is sanctified as a
vile thing, and offers insult to the Holy Ghost! A man stained with sin
despises and tramples on the Lamb of God, when, as the Apostle says, not
discerning the sacred Bread, which is Christ, from other food, he eats
unworthily by being guilty of unworthy actions; for the Lord has said by
His Prophet: "Cursed is the man who does the work of God with
negligence or fraud." And on account of those priests who will not lay
these things seriously to heart, we are condemned, when Our Lord says:
"I will curse your blessings."'