“It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, they are spirit, and they are life.”
King James Version (KJV)
6:63 It is the Spirit - The spiritual meaning of these words, by which God giveth life. The flesh - The bare, carnal, literal meaning, profiteth nothing. The words which I have spoken, they are spirit - Are to be taken in a spiritual sense and, when they are so understood, they are life - That is, a means of spiritual life to the hearers.
Joh 6:63 It is the spirit that quickeneth. We may paraphrase this verse thus: I shall ascend to heaven so that my body cannot be literally eaten; the flesh literally profits nothing. It is the spirit that makes alive. The spirits of men must feed upon me by faith, that they may be made alive. My words are spirit and life. He who feeds upon them will be made alive.