“Therefore you are no longer a slave but a son, and if a son, then an heir of God through Christ”
Paul concludes his argument about sonship with a summary of his point by the word “therefore.”
The word “you” is in the singular making the application very personal to the Galatians.
are no longer a slave but a son,
The believer is not a slave under the law but a son with adult privileges with God under grace. The Christian is free from the law because he is a “son.” Sonship brings with it the privileges of an heir. The Galatians are free from slavery to the law.
and if a son, then an heir of God through Christ
We are an heir of God and joint-heir with Christ.
“The Spirit Himself 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 indeed we suffer with Him, that we may also be glorified together” (Romans 8:16-17).
Because we are God’s sons, we fall heir to God’s provision.
Christians are joint-heirs with Christ. Many of married couples have joint bank accounts. Often the first thing young couples do when they get married is to take out a joint account. They put their entire assets into the account in one big lump. They assume that it is a 50/50 account; 50 percent is hers and 50 percent is his. It doesn’t work that way, however. He beats her to the withdrawal every time. Our joint account with Christ is not a 50/50 deal. We hold all of His assets equally with Him. Are you writing spiritual checks that are tantamount to the kind of account you have with God?
What Jesus Christ did for us in the incarnation was incalculable. The Son of God became the Son of Man that the sons of men might become the sons of God. Christ came down from where He was to where we are that He might lift us from where we are to where He is eternally.
The Christ is the heir of all things (Hebrews 1:1,2). His privilege as an heir is based on his Sonship (Romans 8:16,17); He is an heir because He is the Son of the Father. We are heirs of Christ and fall heirs to eternal life (Titus 3:7); to fall heir to Christ demands that we fall heirs to eternal life. The heirs of Christ share His destiny (Ephesians 1:11). The Father elected both Christ and us from eternity (Hebrews 9:15). We, therefore, share Jesus’ election and destiny. This guarantees our eternal security (1 Peter 1:4,5).
God always makes us heirs based on His grace (Galatians 3:29). The Holy Spirit is the down payment on our eternal inheritance (Galatians 4:6; Ephesians 1:14).