Persevere in discipline and obedience, and with an honest and firm will keep that which you have promised.
After this opening Francis immediately passes to the essential matter of the letter, that of the love and respect due to the Sacrament of the altar; faith in this mystery of love appeared to him indeed as the salvation of the Order.
Was he wrong?
How can a man who truly believes in the real presence of the God-Man between the fingers of him who lifts up the host, not consecrate his life to this God and to holiness?
One has some difficulty in imagining.
It is true that legions of devotees profess the most absolute faith in this dogma, and we do not see that they are less bad; but faith with them belongs in the intellectual sphere; it is the abdication of reason, and in sacrificing their intelligence to God they are most happy to offer to him an instrument which they very much prefer not to use.
To Francis the question presented itself quite differently; the thought that there could be any merit in believing could never enter his mind; the fact of the real presence was for him of almost concrete evidence.
Therefore his faith in this mystery was an energy of the heart, that the life of God, mysteriously present upon the altar, might become the soul of all his actions.
To the eucharistic transubstantiation, effected by the words of the priest, he added another, that of his own heart.
God offers himself to us as to his children.

This is why I beg you, all of you, my brothers, kissing your feet, and with all the love of which I am capable, to have all possible respect for the body and blood of our Lord Jesus Christ.
Then addressing himself particularly to the priests: Hearken, my brothers, if the blessed Virgin Mary is justly honored for having carried Jesus in her womb, if John the Baptist trembled because he dared not touch the Lord's head, if the sepulchre in which for a little time he lay is regarded with such great adoration, oh, how holy, pure, and worthy should be the priest who touches with his hands, who receives into his mouth and into his heart, and who distributes to others the living, glorified Jesus, the sight of whom makes angels rejoice! Understand your dignity, brother priests, and be holy, for he is holy.

Oh! what great wretchedness and what a frightful infirmity to have him there present before you and to think of other things.

Let each man be struck with amazement, let the whole earth tremble, let the heavens thrill with joy when the Christ, the Son of the living God, descends upon the altar into the hands of the priest.

Oh, wonderful profundity! Oh, amazing grace! Oh, triumph of humility! See, the Master of all things, God, and the Son of God, humbles himself for our salvation, even to disguising himself under the appearance of a bit of bread.
Contemplate, my brothers, this humility of God, and enlarge your hearts before him; humble yourselves as well, that you, even you, may be lifted up by him.