15.  Give us this day our substantial bread.  This common bread is not substantial bread, but this Holy Bread is substantial, that is, appointed for the substance of the soul “It is manifest that the author derives the word ἐπιούσιος from the two words ἐπί and οὐσία, as do many others:  although the explanation which derives it from ἐπιούσῃ ἡμέρᾳ is more probable.  We render it “substantial” in accordance with Cyril’s meaning, with which the word “super-substantial does not agree” (Ben. Ed.)..  For this Bread goeth not into the belly and is cast out into the draught Matt. xv. 17., but is distributed into thy whole system for the benefit of body and soul Cat. xxii. § 3, note 1.  Ben. Ed. “We are not to think that Cyril supposed the Body of Christ to be distributed and digested into our body; but in the usual way of speaking he attributes to the Holy Body that which belongs only to the species under which It is hidden.  Nor does he deny that those species pass into the draught, but only the Body of Christ.”  Cf. Iren. V. ii. 2, 3, and “Eucharistic Doctrine” in the Introduction..  But by this day, he means, “each day,” as also Paul said, While it is called to-day Heb. iii. 15..