Chapter 18 — Part II: The Sacraments — The Holy Eucharist
Section 40. Again as in the sacred mysteries priests must be mindful to mingle water with wine, so, also, must they take care to mingle it in small quantity, for, in the opinion and judgment of ecclesiastical writers, that water is changed into wine. Hence these words of Pope Honorius on the subject: A pernicious abuse has prevailed in your district of using in the sacrifice a greater quantity of water than of wine; whereas, according to the rational practice of the universal Church, the wine should be used in much greater quantity than the water.