Romans 8:12-16

So then, brethren, we are debtors, not to the flesh, to live after the flesh: for if ye live after the flesh, ye must die; but if by the Spirit ye put to death the deeds of the body, ye shall live. For as many as are led by the Spirit of God, these are sons of God. For ye received not the spirit of bondage again unto fear; but ye received the spirit of adoption, whereby we cry, Abba, Father. The Spirit himself beareth witness with our spirit, that we are children of God