He says, it is true, that “the flesh profits nothing;” John 6:63 but then, as in the former case, the meaning must be regulated by the subject which is spoken of. Now, because they thought His discourse was harsh and intolerable, supposing that He had really and literally enjoined on them to eat his flesh, He, with the view of ordering the state of salvation as a spiritual thing, set out with the principle, “It is the spirit that quickens;” and then added, "The flesh profits nothing,"—meaning, of course, to the giving of life. He also goes on to explain what He would have us to understand by spirit: “The words that I speak unto you, they are spirit, and they are life.” In a like sense He had previously said: “He that hears my words, and believes in Him that sent me, has everlasting life, and shall not come into condemnation, but shall pass from death unto life.” John 5:24 Constituting, therefore, His word as the life-giving principle, because that word is spirit and life, He likewise called His flesh by the same appellation; because, too, the Word had become flesh, John 1:14 we ought therefore to desire Him in order that we may have life, and to devour Him with the ear, and to ruminate on Him with the understanding, and to digest Him by faith. Now, just before (the passage in hand), He had declared His flesh to be “the bread which comes down from heaven,” John 6:51 impressing on (His hearers) constantly **under the figure of necessary food **the memory of their forefathers, who had preferred the bread and flesh of Egypt to their divine calling. -Tertullian (On the Resurrection of the Flesh, Chapter 37)
