Read John 6:63 Using Other Translations
It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, they are spirit, and they are life.
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.
The Spirit alone gives eternal life. Human effort accomplishes nothing. And the very words I have spoken to you are spirit and life.