6:63 {14} It is the {x} spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, [they] are spirit, and [they] are life.
(14) The flesh of Christ therefore quickens us, because he that is man is God: and this mystery is only comprehended by faith, which is the gift of God, found only in the elect.
(x) Spirit, that is, that power which flows from the Godhead causes the flesh of Christ (which is otherwise nothing but flesh) both to live in itself and to give life to us.
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.
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.
6:60-65 The human nature of Christ had not before been in heaven, but being God and man, that wondrous Person was truly said to have come down from heaven. The Messiah's kingdom was not of this world; and they were to understand by faith, what he had said of a spiritual living upon him, and his fulness. As without the soul of man the flesh is of no value, so without the quickening Spirit of God all forms of religion are dead and worthless. He who made this provision for our souls, alone can teach us these things, and draw us unto Christ, that we may live by faith in him. Let us apply to Christ, thankful that it is declared that every one who is willing to come unto him shall be made welcome.