Letter to the Romans 8:12-17.
Consequently, brothers, we are not debtors to the flesh, to live according to the flesh.
For if you live according to the flesh, you will die, but if by the spirit you put to death the deeds of the body, you will live.
For those who are led by the Spirit of God are children of God.
For you did not receive a spirit of slavery to fall back into fear, but you received a spirit of adoption, through which we cry, “Abba, Father!”
The Spirit itself bears witness with our spirit that we are children of God,
and if children, then heirs, heirs of God and joint heirs with Christ, if only we suffer with him so that we may also be glorified with him.