“Where is boasting then? It is excluded. By what law? Of works? No, but by the law of faith” (Romans 3:27).
Because of His inherent authority and majesty, God’s sovereignty is dispersed by laws, not suggestions or hints.
Our natural world, for example, is governed by the laws God has decreed. Gravity, biogenesis, cause and effect, thermodynamics, et. al., are scientific laws, not theories or suggestions. All creation is upheld by God’s powerful word which made these laws (Hebrews 1:3).
When God delivered His authoritative will for the children of Israel to live by until the coming of Christ and His gospel, He gave to Moses the Law (not a theory or suggestions). If God’s law was obeyed, Israel was blessed; if it was disobeyed, Israel was cursed (Deuteronomy 28).
Jesus’ will—the new covenant inaugurated by His blood—is also authoritative. Unlike the Law of Moses given to the Jews, Christ’s law is for every creation in all nations.
Since the gospel is called the “one faith” (Ephesians 4:5) and requires obedient faith in response to it, “the law of faith” is a most suitable moniker for it.
Because the gospel provides complete spiritual freedom from Satan, sin, and death, “the perfect law of liberty” (James 1:25) is also most fitting.
Since the gospel frees a person from the bondage of the law of sin and death, “the law of the Spirit of life in Christ Jesus” (Romans 8:2) is most appropriate.
The law of faith, the perfect law of liberty, the law of the Spirit of life in Christ Jesus are all references to the same thing. Because of God’s grace, the law of Christ (Galatians 6:2) has been given humanity until time is no more.