, because by the water is denoted the
cleansing from sins, which was the effect of Christ's Passion. Now it
was observed above (Q. 73, A. 1, ad 3), that this sacrament is
completed in the consecration of the matter: while the usage of the
faithful is not essential to the sacrament, but only a consequence
thereof. Consequently, then, the adding of water is not essential to
the sacrament.

Reply Obj. 1: Cyprian's expression is to be taken in the same sense
in which we say that a thing cannot be, which cannot be suitably. And
so the comparison refers to what ought to be done, not to what is
essential to be done; since water is of the essence of bread, but not
of the essence of wine.

Reply Obj. 2: The shedding of the blood belonged directly to Christ's
Passion: for it is natural for blood to flow from a wounded human
body. But the flowing of the water was not necessary for the Passion;
but merely to show its effect, which is to wash away sins, and to
refresh us from the heat of concupiscence. And therefore the water is
not offered apart from the wine in this sacrament, as the wine is
offered apart from the bread; but the water is offered mixed with the
wine to show that the wine belongs of itself to this sacrament, as of
its very essence; but the water as something added to the wine.

Reply Obj. 3: Since the mixing of water with the wine is not
necessary for the sacrament, it does not matter, as to the essence
of the sacrament, what kind of water is added to the wine, whether
natural water, or artificial, as rose-water, although, as to the
propriety of the sacrament, he would sin who mixes any other than
natural and true water, because true water flowed from the side of
Christ hanging on the cross, and not phlegm, as some have said, in
order to show that Christ's body was truly composed of the four
elements; as by the flowing blood, it was shown to be composed of
the four humors, as Pope Innocent III says in a certain Decree.
But because the mixing of water with flour is essential to this
sacrament, as making the composition of bread, if rose-water, or
any other liquor besides true water, be mixed with the flour, the
sacrament would not be valid, because it would not be true bread.
_______________________

EIGHTH ARTICLE [III, Q. 74, Art. 8]

Whether Water Should Be Added in Great Quantity?

Objection 1: It seems that water ought to be added in great quantity,
because as blood flowed sensibly from Christ's side, so