The point is you cannot have mixed metaphors in any one of Jesus' teachings. It doesn't make sense. Nobody asked Jesus if He was a literal vine, and nobody asked Jesus if he was a literal door. His use of metaphors was obvious and that is why no one questioned him. But they did question Him in John 6 if He meant metaphorical, or symbolic, or figurative. He made himself quite clear.
John 6:51-52- then Jesus says that the bread He is referring to is His flesh. The Jews take Him literally and immediately question such a teaching. How can this man give us His flesh to eat?
John 6:53 - 58 - Jesus does not correct their literal interpretation. Instead, Jesus eliminates any metaphorical interpretations by swearing an oath and being even more literal about eating His flesh. In fact, Jesus says four times we must eat His flesh and drink His blood.
John 6:23-53 - however, a symbolic interpretation is not plausible. Throughout these verses, the Greek text uses the word "phago" nine times. "Phago" literally means "to eat" or "physically consume." Like the Protestants of our day, the disciples take issue with Jesus' literal usage of "eat." So Jesus does what?
John 6:54, 56, 57, 58 - He uses an even more literal verb, translated as "trogo," which means to gnaw or chew or crunch. He increases the literalness and drives his message home. Jesus will literally give us His flesh and blood to eat. The word trogo is only used two other times in the New Testament (in Matt. 24:38 and John 13:18) and it always means to literally gnaw or chew meat. While phago might also have a spiritual application,
"trogo" is never used metaphorically in Greek. So Protestants cannot find one verse in Scripture where "trogo" is used symbolically, and yet this must be their argument if they are going to deny the Catholic understanding of Jesus' words. Moreover, the Jews already knew Jesus was speaking literally even before Jesus used the word trogo when they said How can this man give us His flesh to eat? (John 6:52).
John 6:55 - to clarify further, Jesus says "For My Flesh is food indeed, and My Blood is drink indeed." This phrase can only be understood as being responsive to those who do not believe that Jesus' flesh is food indeed, and His blood is drink indeed. Further, Jesus uses the word which is translated as "sarx." "Sarx" means flesh (not "soma" which means body). See, for example, John 1:13,14; 3:6; 8:15; 17:2; Matt. 16:17; 19:5; 24:22; 26:41; Mark 10:8; 13:20; 14:38; and Luke 3:6; 24:39 which provides other examples in Scripture where "sarx" means flesh. It is always literal.
John 6:55 - further, the phrases "real" food and "real" drink use the word "alethes." "Alethes" means "really" or "truly," and would only be used if there were doubts concerning the reality of Jesus' flesh and blood as being food and drink. Thus, Jesus is emphasizing the miracle of His body and blood being actual food and drink.
John 6:60 - as are many anti-Catholics today, Jesus' disciples are scandalized by these words. They even ask, "Who can 'listen' to it (much less understand it)?" To the unillumined mind, it seems grotesque.
John 6:61-63 - Jesus acknowledges their disgust. Jesus' use of the phrase "the spirit gives life" means the disciples need supernatural faith, not logic, to understand His words.
John 3:6 - Jesus often used the comparison of "spirit versus flesh" to teach about the necessity of possessing supernatural faith versus a natural understanding. In Mark 14:38 Jesus also uses the "spirit/flesh" comparison. The spirit is willing but the flesh is weak. We must go beyond the natural to understand the supernatural. In 1 Cor. 2:14,3:3; Rom 8:5; and Gal. 5:17, Paul also uses the "spirit/flesh" comparison to teach that unspiritual people are not receiving the gift of faith. They are still "in the flesh."
John 6:63 - Protestants often argue that Jesus' use of the phrase "the spirit gives life" shows that Jesus was only speaking symbolically. However, Protestants must explain why there is not one place in Scripture where "spirit" means "symbolic." As we have seen, the use of "spirit" relates to supernatural faith. What words are spirit and life? The words that we must eat Jesus' flesh and drink His blood, or we have no life in us.
John 6:66-67 - many disciples leave Jesus, rejecting this literal interpretation that we must eat His flesh and drink His blood. At this point, these disciples really thought Jesus had lost His mind. If they were wrong about the literal interpretation, why wouldn't Jesus, the Great Teacher, have corrected them? Why didn't Jesus say, "Hey, come back here, I was only speaking symbolically!"? Because they understood correctly.
Mark 4:34 - Jesus always explained to His disciples the real meanings of His teachings. He never would have let them go away with a false impression, most especially in regard to a question about eternal salvation.
John 6:37 - Jesus says He would not drive those away from Him. They understood Him correctly but would not believe.
John 3:5,11; Matt. 16:11-12 - here are some examples of Jesus correcting wrong impressions of His teaching. In the Eucharistic discourse, Jesus does not correct the scandalized disciples.
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