45. But these writings of the apostles, though clear, are yet profound, and are so written that one who is not content with a superficial acquaintance, but desires to know them thoroughly, must not only read and hear them, but must have an expositor. Let us, then, study these various modes of speech as they are exemplified in the writings of men who, by reading the Scriptures, have attained to the knowledge of divine and saving truth, and have ministered it to the Church. Cyprian of blessed memory writes in the subdued style in his treatise on the sacrament of the cup. In this book he resolves the question, whether the cup of the Lord ought to contain water only, or water mingled with wine. But we must quote a passage by way of illustration. After the customary introduction, he proceeds to the discussion of the point in question. "Observe," he says, "that we are instructed, in presenting the cup, to maintain the custom handed down to us from the Lord, and to do nothing that our Lord has not first done for us: so that the cup which is offered in remembrance of Him should be mixed with wine. For, as Christ says, 'I am the true vine,' it follows that the blood of Christ is wine, not water; and the cup cannot appear to contain His blood by which we are redeemed and quickened, if the wine be absent; for by the wine is the blood of Christ typified, that blood which is foreshadowed and proclaimed in all the types and declarations of Scripture. For we find that in the book of Genesis this very circumstance in regard to the sacrament is foreshadowed, and our Lord's sufferings typically set forth, in the case of Noah, when he drank wine, and was drunken, and was uncovered within his tent, and his nakedness was exposed by his second son, and was carefully hidden by his elder and his younger sons. It is not necessary to mention the other circumstances in detail, as it is only necessary to observe this point, that Noah, foreshadowing the future reality, drank, not water, but wine, and thus showed forth our Lord's passion. In the same way we see the sacrament of the Lord's supper prefigured in the case of Melchizedek the priest, according to the testimony of the Holy Scriptures, where it says: 'And Melchizedek king of Salem brought forth bread and wine: and he was the priest of the most high God. And he blessed Abraham.' Now, that Melchizedek was a type of Christ, the Holy Spirit declares in the Psalms, where the Father addressing the Son says, 'Thou art a priest forever after the order of Melchizedek.'" In this passage, and in all of the letter that follows, the subdued style is maintained, as the reader may easily satisfy himself.