Paul explains the problems with being legalistic. Then closes with the love of a father caring for his child.
Paul talks about the works of the flesh that we need to avoid. Then we look at the Fruit of the Spirit that God is developing in each of us.
Choosing Law is rejecting Jesus Christ and the Holy Spirit. Your relationship with God is not based on your performance.
We discover being under Law is a slavery we are born into. So we must be born again to be under God's grace.