Tell me, you who want to live under the law, do you know what the law actually says?
Gal 4:21 (NLT)
In Gal 4:22-31, Paul uses Abraham's 2 wives, Sarah and Hagar to illustrate God's two covenants.
Sarah the heavenly Jerusalem versus Hagar the earthly Jerusalem akin to Mount Sinai, where the Israelites received the Law that enslaved them.
Sarah the free woman versus Hagar the slave woman. Gal 4:31 says that we are children of the free woman, not the slave woman.
Since the Law is no longer relevant, how do we maintain order in our lives?
Through the Holy Spirit! Christ has truly set us free. Now make sure that you stay free, and don’t get tied up again in slavery to the law.
For you have been called to live in freedom, my brothers and sisters but don’t use your freedom to satisfy your sinful nature. Instead, use your freedom to serve one another in love, for the whole law can be summed up in this one command: “Love your neighbor as yourself.”
So I say, let the Holy Spirit guide your lives. Then you won’t be doing what your sinful nature craves.
The sinful nature wants to do evil, which is just the opposite of what the Spirit wants. The Spirit gives us desires that are the opposite of what the sinful nature desires. These two forces are constantly fighting each other, so you are not free to carry out your good intentions but when you are directed by the Spirit, you are not under obligation to the law of Moses.
The Holy Spirit produces this kind of fruit in our lives: love, joy, peace, patience, kindness, goodness, faithfulness, gentleness, and self-control. There is no law against these things!
Those who belong to Christ Jesus have nailed the passions and desires of their sinful nature to his cross and crucified them there. Since we are living by the Spirit, let us follow the Spirit’s leading in every part of our lives.
(btw, the above paragraphs in blue is lifted almost word for word from Gal 5:1,13-18,22-25 NLT because I couldn't have said it any better myself)
We believers should live by the Spirit because when we believed in Christ, we have been stamped by the seal of the Holy Spirit (Ephesians 1:13-14).
The Holy Spirit is the third person of the Godhead but many believers under-estimate or are sceptical of the power of the Holy Spirit to transform their lives. They do not see the Holy Spirit as a person unlike the way they see the Heavenly Father and Jesus, the Son.
The Holy Spirit is often perceived as an invisible spiritual force. Since the Holy Spirit is viewed as intangible, many Christians want the Ten Commandments, which is tangible, to be the guideline in their daily walk. But as I have submitted through these four episodes of Law & Order, the Ten Commandments are no longer relevant.
Instead, let the Spirit renew your thoughts and attitudes. (Ephesians 4:23, NLT)