Having established the fact that we are sons of God and fellow heirs with Christ, Paul gives us two factors proving our Sonship. First, Romans 8:14 says that we are being led by the Spirit. Second, verse 17 says that "we suffer with Him in order that we may also be glorified with Him."
This is primarily a reference to our identification with Christ in His crucifixion and death as well as His resurrection life. As we put to death the flesh and live in the power of resurrection life, we give clear evidence that we are the sons of God. Paul then continues...
