In John 6:63, NIV. The Spirit gives life; the flesh counts for nothing.
Jesus has the words of eternal life.
John 6:63-69
[63]What gives life is God’s Spirit; human power is of no use at all. The words I have spoken to you bring God’s life-giving Spirit.
[64]Yet some of you do not believe.” (Jesus knew from the very beginning who were the ones that would not believe and which one would betray him.)
[65]And he added, “This is the very reason I told you that no one can come to me unless the Father makes it possible for him to do so.”
[66]Because of this, many of Jesus’ followers turned back and would not go with him any more.
[67]So he asked the twelve disciples, “And you — would you also like to leave?”
[68]Simon Peter answered him, “Lord, to whom would we go? You have the words that give eternal life.
[69]And now we believe and know that you are the Holy One who has come from God.”