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.
Related Commentaries of John 6:63
John 6:63
63 It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, they are spirit, and they are life.