Grace saves sinners through faith in Christ, while God's law shows what love looks like. Obedience is the fruit of salvation, not the price paid to receive it.
The Bible never presents God's grace and God's law as enemies. Grace forgives, restores, and writes God's will on the heart; the law reveals God's character and shows what love for God and neighbor looks like in practical life. Legalism tries to use obedience as a ladder to earn acceptance, but the gospel teaches that acceptance comes through Christ alone. At the same time, grace does not make rebellion desirable. The Spirit leads believers into willing obedience because they have already been loved, rescued, and made new.
Salvation is entirely by grace through faith in Christ. His atoning sacrifice, heavenly ministry, and intercession are the foundation of assurance; obedience, Sabbath faithfulness, and loving service are the fruit of a redeemed life, never a way to purchase acceptance with God.