18. Again the Lord Himself revealing this mystery of His birth, speaks thus: I am the living bread Who have descended from Heaven: if any one shall eat of My bread he shall live for ever615 St. John vi. 51.: calling Himself the Bread since He is the origin of His own body. Further, that it may not be thought the Word left His own virtue and nature for the flesh, He says again that it is His bread; since He is the bread which descends from heaven, His body cannot be regarded as sprung from human conception, because it is shewn to be from heaven. And His language concerning His bread is an assertion that the Word took a body, for He adds, Unless ye eat the flesh of the Son of Man and drink His blood, ye have not life in you616 Ib. vi. 54.. Hence, inasmuch as the Being Who is Son of Man descended also as bread from heaven, by the ‘Bread descending from heaven’ and by the ‘Flesh and Blood of the Son of Man’ must be understood His assumption of the flesh, conceived by the Holy Ghost, and born of the Virgin.
18. Quae caro filii hominis quia ex Virgine, panis de coelo est quia ex sancto Spiritu.---Ipse autem Dominus 0356B hujus nativitatis suae mysterium pandens sic locutus est: Ego sum panis vivus qui de coelo descendi: si quis manducaverit de pane meo, vivet in aeternum (Joan. VI, 51, 52), se panem dicens; ipse enim corporis sui origo est. Ac ne Verbi virtus atque natura defecisse a se existimaretur in carnem, 333 panem suum rursus esse dixit: ut per hoc, quod descendens de coelis panis est, non ex humana conceptione origo esse corporis 0357A existimaretur, dum coeleste esse corpus ostenditur. At vero cum suus panis est, assumpti per Verbum corporis est professio; subjecit enim: Nisi manducaveritis carnem filii hominis, et sanguinem ejus biberitis, non habebitis vitam in vobis (Ibid., 54): ut quia id, quod filius hominis est, et panis de coelis ipse descendit: per panem suum de coelo descendentem, et per carnem ac sanguinem filii hominis, et conceptae ex Spiritu sancto, et natae ex Virgine carnis intelligatur assumptio.