Had to say “other” - Cyril of Jerusalem. Love his teachings on the Eucharist and the Church. I also believe he was the first
“Do not, therefore, regard the bread and wine as simply that, for they are, according to the Master’s declaration, the Body and Blood of Christ. Even though the senses suggest to you the other, let faith make you firm. Do not judge in this matter by taste, but be fully assured by faith, not doubting that you have been deemed worthy of the Body and Blood of Christ.” – St. Cyril of Jerusalem, ibid. 4, 22, 6 (c. 350 AD).
“He Himself, therefore, having declared and said of the Bread, ‘This is My Body,’ who will dare any longer to doubt? And when He Himself has affirmed and said, ‘This is My Blood,’ who can ever hesitate and say it is not His Blood?” – St. Cyril of Jerusalem, Catechetical Lectures: Mystagogic 4, 22, 1 (c. 350 AD).
“Having learnt these things, and been fully assured that the seeming bread is not bread, though sensible to taste, but the Body of Christ; and that the seeming wine is not wine, though the taste will have it so, but the Blood of Christ: and that of this David sung of old, saying, ‘And bread strengthens man’s heart, to make his face to shine with oil’ (Ps. 103:15), strengthen your heart by partaking thereof as spiritual, and make the face of your soul to shine.” – St. Cyril of Jerusalem, Catecheses, 22:9 (c. 350 AD).
“[The Church] is called Catholic, then, because it extends over the whole world, from end to end of the earth, and because it teaches universally and infallibly each and every doctrine which must come to the knowledge of men, concerning things visible and invisible, heavenly and earthly, and because it brings every race of men into subjection to godliness, governors and governed, learned and unlearned, and because it universally treats and heals every class of sins, those committed with the soul and those with the body, and it possesses within itself every conceivable form of virtue, in deeds and in words and in the spiritual gifts of every description” (Catechetical Lectures 18:23 [A.D. 350]).
“And if you ever are visiting in cities, do not inquire simply where the house of the Lord is–for the others, sects of the impious, attempt to call their dens ‘houses of the Lord’–nor ask merely where the Church is, but where is the Catholic Church. For this is the name peculiar to this holy Church, the Mother of us all, which is the Spouse of our Lord Jesus Christ, the only-begotten Son of God” (ibid., 18:26).