It is the Spirit who gives life; the flesh profits nothing. The words that I speak to you are spirit, and they are life. John 6:63 NKJV.
Because the carnal mind is enmity against God: for it is not subject to the law of God, neither indeed can be. So then they that are in the flesh cannot please God. Romans 8:8
For what man knows the things of a man except the spirit of the man which is in him? Even so no one knows the things of God except the Spirit of God. I Corinthians 2:11