Did you stop reading at verse 59? Keep reading. You might learn something. Read John 6:63, "It is the Spirit who gives life; the flesh is no help at all. The words that I have spoken to you are spirit and life."<quoted text>
And Zwingli had "no authority" to "reject and (throw out) the teachings of Jesus, in John 6:47-59, regarding the Eucharist (the TRUE BODY and TRUE BLOOD of Jesus Christ HIMSELF!!
Can you get a grip on this verse or did it just go over your head?