Chapter 18 — Part II: The Sacraments — The Holy Eucharist
Section 91. But although these are matters on which the faithful cannot entertain a doubt, it was nevertheless wisely ordained that two distinct consecrations should take place. First, because they represent in a more lively manner the Passion of our Lord, in -which His blood was separated from His body; and hence in the form of consecration we commemorate the shedding of His blood. Secondly, since the Sacrament is to be used by us as the food and nourishment of our souls, it was most appropriate that it should be instituted as food and drink, two things which obviously constitute the complete sustenance of the (human) body.