John 3:6
That which has been born of the flesh is flesh: and that which has been born of the Spirit is spirit.
Romans 5:12
Therefore, as through one man sin entered into the world, and death through sin; and so death passed unto all men, for that all sinned;
Ephesians 2:3
among whom we also all once lived in the desires of our flesh, doing the will of the flesh and of the mind, and were by nature children of wrath, even as the rest;
Luke 1:35
And the angel, answering, said to her, The Holy Spirit will come upon you, and the power of the Most High will overshadow you; wherefore also the Holy Thing that is begotten shall be called the Son of God.
Romans 8:8-9
and those who are in the flesh cannot please God.