Please read the passage before the homily
You are all slaves. Your masters bought you. They paid money for you. They own you and have power over your life and your death. This is the thinking behind slavery. This was the thinking of Roman slaves.
If you think this way, Paul writes, then you are debtor to the flesh, and if you live this way, you will die.
On the other hand, if you live by the spirit of God, you are children of God, not slaves. Then you are not owned by slave masters. Then you are children of God and can call God, “Abba”, which means dad, daddy, or father.
Marks on the body may assign a slave to a particular owner, but God’s Spirit marks us out as children of the Father. If we are children and not slaves, then we are heirs of the Father, joint heirs with Christ.
Even if we have to suffer, as slaves have had to suffer from the beginning of time, we are nevertheless children of God and we shall be glorified with Christ.
This message to the slaves at Rome applies also to us. We are not debtors according to the flesh, but we filled with the Spirit of God. It is worth noting that the “you” in the reading is plural, not singular. When Paul says “you” here, he means “you all”. The whole bunch of the Roman slaves and the whole bunch of us are children of God and heirs with Christ. Live then as children of the light and call God Father.