The first step in becoming right with God is the conviction of sin. “Sin is lawlessness.” “By the law is the knowledge of sin.” (1 John 3:4; Romans 3:20.) In order to see their guilt, sinners must test their character by God's law—a mirror that shows what a perfect righteous character looks like and enables them to recognize the defects in their own. LF 192.3
The law shows us our sin, but it provides no remedy. It declares that death is the reward of the transgressor. Only the gospel of Christ can free us from the condemnation or the defilement of sin. We must have repentance toward God, whose law we have broken, and faith in Christ, our atoning sacrifice. In this way we receive forgiveness for “sins that were previously committed” (Romans 3:25) and become children of God. LF 192.4
Are we now free to disobey God's law? Paul says: “Do we then make void the law through faith? Certainly not! On the contrary, we establish the law.” “How shall we who died to sin live any longer in it?” John declares: “This is the love of God, that we keep His commandments. And His commandments are not burdensome.” In the new birth the heart comes into harmony with God and His law. When this change has taken place, the sinner has passed from death into life, from law-breaking and rebellion to obedience and loyalty. The old life has ended; the new life of forgiveness, faith, and love has begun. Then “the righteous requirement of the law” will “be fulfilled in us who do not walk according to the flesh but according to the Spirit.” The language of the heart will be: “Oh, how I love Your law! It is my meditation all the day.” (Romans 3:31; 6:2; 1 John 5:3; Romans 8:4; Psalm 119:97.) LF 192.5
Without the law, people have no true conviction of sin and feel no need to repent. They do not realize how much they need the atoning blood of Christ. They accept the hope of salvation without a radical change of heart or reformation of life. So there are many superficial conversions, and many people join the church who have never been united to Christ. LF 193.1