Today we celebrate the feast of St. Cyril of Jerusalem St. Cyril of Jerusalem was Bishop of Jerusalem and Doctor of the Church. He was born about 315; died probably March 18, 386. In the East his feast is observed on the 18th of March, in the West on the 18th or 20th. Little is known of his life. We gather information concerning him from his younger contemporaries, Epiphanius, Jerome, and Rufinus, as well as from the fifth-century historians, Socrates, Sozomen and Theodoret. Cyril himself gives us the date of his "Catecheses" as fully seventy years after the Emperor Probus, that is about 347, if he is exact. Constans (d. 350) was then still alive.
St. Cyril's teaching about the Blessed Sacrament is of the first importance, for he was speaking freely, untrammelled by the "discipline of the secret". On the Real Presence he is unambiguous: "Since He Himself has declared and said of the bread: This is My Body, who shall dare to doubt any more? And when He asserts and says: This is My Blood, who shall ever hesitate and say it is not His Blood?" Of the Transformation, he argues, if Christ could change water into wine, can He not change wine into His own Blood? The bread and wine are symbols: "In the type of bread is given thee the Body, in the type of wine the Blood is given thee"; but they do not remain in their original condition, they have been changed, though the senses cannot tell us this: "Do not think it mere bread and wine, for it is the Body and Blood of Christ, according to the Lord's declaration". "Having learned this and being assured of it, that appears to be bread is not bread, though perceived by the taste, but the Body of Christ, and what appears to be wine is not wine, though the taste says so, but the Blood of Christ . . . strengthen thy heart, partaking of it as spiritual (food), and rejoice the face of thy soul." Here is a link to his Lenten catechetical lectures that he gave.