Now I say, for as long a time as the heir is an inarticulate babbler, he does not differ from a slave, being lord of all, but is under guardians and stewards until the time appointed by the father (Galatians 4:1–2).
As members of the body of the Christ and children of God, we are placed as sons and coheirs with Christ. The placement of sons pertains to our position. A son is one who is mature, able to discern right from wrong and act appropriately. Under the Mosaic Law, the Jews were treated as children—ones who are inarticulate babblers—under governors and tutors until faith in Christ came.
Therefore, the Christian does not mature by law; rather, it is by living out from faith by grace that he is able to mature by using the freedom he has in Christ to act in a righteous manner in all things, while seeking out and doing the desires from the Holy Spirit.