Summary: What it means to be heirs of God, and joint heirs with Christ
DRAWN INTO THE FAMILY OF GOD
1. The mortification of sin (Romans 8:12-14)
Paul has just commented that “if Christ is in you the body is dead on account of sin” (Romans 8:10). And that “the Spirit of Him who raised up Jesus from the dead will also quicken (revivify, make alive) your mortal bodies by His Spirit who dwells in you” (Romans 8:11).
On account of this we have an obligation - a debt of gratitude - “not to live according to the flesh” but (by inference) according to the Spirit (Romans 8:12). This is a process known as ‘the mortification of sin in our bodies.’ This is a “putting to death” of sin - a handing it over to be executed (Romans 8:13).
Jesus was handed over into the hands of evil men, and crucified (Luke 24:7), and we are instructed to ‘take up the cross daily and follow Him’ (Luke 9:23). The execution of our fleshly nature has taken place (Galatians 5:24), but it is the responsibility of each of us to go on mortifying the misdeeds of the body. It is a life choice (Deuteronomy 30:19).
The only way to put our sins to death is through the empowering of the Holy Spirit (Romans 8:13), and by His leading (Romans 8:14). However, if we really are Christians, then the Holy Spirit has already taken up residence within us (Romans 8:9). This is a powerful resource, which we are obliged to tap into.
The idea of being “led by the Spirit” (Romans 8:14) is a yielding to His guidance. It may or may not include the idea of being ‘driven’ (Matthew 4:1; cf. Mark 1:12), but could be as tender an operation as removing the speck from your brother’s eye (Matthew 7:4). As the Holy Spirit enlightens us in relation to the sins which we commit, so He persuades us to deal with them - and our submission to His control is, in the final analysis, voluntary.
One of the proofs of our interest in this matter is a holy abhorrence toward sin, especially within ourselves. As we deal with this (Romans 8:13) we enter into the fullness that Jesus promises (John 10:10). It is only those who are led by the Spirit of God who are thus manifested to be “the sons of God” (Romans 8:14).
2. The witness of the Holy Spirit (Romans 8:15-17)
Not everybody receives Jesus, nor believes in His name (John 1:11-12). Our inclusion in the family of God is on account of our faith (Galatians 3:26). So - although Paul said elsewhere, quoting the Greek poets, ‘we are all His offspring’ (Acts 17:28) - it is not the so-called and somewhat overstated ‘universal Fatherhood of God’ that the Apostle is speaking about here.
As children of God we have been translated from an area of bondage to fear (Galatians 4:3), into the freedom of a loving relationship with God (Romans 8:15). In Roman times to be ‘adopted’ was to be brought into the father’s family to inherit his estate and perpetuate his name. We have, on this analogy, been hand-picked to bear the Father’s name and reproduce His character in our lives - not on account of any worthiness on our own part, but out of His love (1 John 3:1).