Romans 3:20 Meaning: What the Law Actually Does
Because by the works of the law, no flesh will be justified in his sight; for through the law comes the knowledge of sin.
Therefore by the deeds of the law there shall no flesh be justified in his sight: for by the law is the knowledge of sin.
because by the works of the law shall no flesh be justified in his sight; for through the law cometh the knowledge of sin.
wherefore by works of law shall no flesh be declared righteous before Him, for through law is a knowledge of sin.
Wherefore by works of law no flesh shall be justified before him; for by law [is] knowledge of sin.
Meaning in one sentence
Paul concludes no one can be justified by obeying the law. Its real job is to give us a true knowledge of our sin.
Context
Paul has spent three chapters building a case. Jews and Gentiles alike stand guilty before God. No one is righteous, not one. Now he arrives at the conclusion: obedience to the law cannot make a person right with God. The law was never given for that purpose. Instead, the law shines a light into the dark corners of our hearts. It shows us where we have gone wrong. That knowledge is painful, but it is also honest. Only when we see our need are we ready for the next thing Paul will announce: a righteousness that comes as a gift, through faith in Christ.
Key Words
Three Greek words carry the weight of this verse. Erga nomou means “works of the law.” Paul uses it to describe every attempt to keep God’s commands in our own strength. The law itself is good, but our works are not. Next comes dikaiōthēsetai, “will be justified.” It is a courtroom word. To be justified means to be declared righteous, not made righteous. It is a verdict God pronounces. Finally, epignōsis is the word for “knowledge.” It is not casual awareness. It means full, precise recognition. The law gives us that kind of knowledge about sin. It does not offer a way out; it shows us we are trapped. And that is exactly what we need to hear, so we stop looking for a way out on our own.
How Christians Read This Verse
Christians have long debated what Paul means by “works of the law.” Some early interpreters, like Chrysostom and Jerome, thought Paul referred only to ceremonial commands such as circumcision and food laws. But many later readers, including Calvin, Wesley, and the Cambridge Bible, argue that the context shows Paul means the whole moral law. They point out that the sins he lists are moral failures, not ceremonial ones. The debate matters because it shapes how we understand the scope of our inability. But across traditions, Christians agree on the verse’s central point: no human effort can earn God’s acceptance. The law’s job is to reveal our need, not to fix it.
A common misunderstanding
Some people read this verse and think Paul is dismissing the law as worthless. They conclude the Old Testament has no value for Christians today. In fact, Paul is doing the opposite. He says the law has a vital purpose: it brings knowledge of sin. The law is like a mirror. It shows the dirt on your face, but it cannot wash it off. To ignore the law is to miss the diagnosis. The law is not the problem, sin is. The verse honors the law by telling us its true job.
Living This Out
This week, you will catch yourself trying to earn God’s favor. Maybe you will compare yourself to someone who struggles more, or you will add one more spiritual habit to feel worthy. Stop. This verse invites you to let the law do its work. When you see your failure, do not cover it up or try harder. Let that knowledge push you toward the only One who can declare you righteous. The law points to your need. Jesus meets it.
Main takeaway: The law shows us our sin so that we stop looking to ourselves and start looking to Christ for righteousness.
For Families
For ages 5, 8
God’s rules are like a mirror. They show you when your hands or heart are dirty. But you cannot clean yourself. Only Jesus can wash you clean.
For ages 9, 12
The law is like a test you cannot pass. When you see your wrong answers, you know you need help. Jesus took the test for you and passed it perfectly. He gives you His grade. Trust Him, not your own score.
Questions People Ask
What do 'works of the law' mean in Romans 3:20?
They mean the deeds that the law commands, both the moral and ceremonial commands of the Old Testament. Paul says that no person can be declared righteous by doing those deeds. The law shows us our sin, but it cannot remove it.
Does Romans 3:20 mean the law is bad or useless?
Not at all. Paul honors the law by giving it its proper role. It brings knowledge of sin. A mirror is not bad because it shows dirt. The law is a God-given tool to reveal our need for grace.
What does 'justified' mean in this verse?
Justified is a legal term. It means to be declared righteous, not to be made righteous internally. In Romans, God is the judge who announces a verdict. A justified person is treated as innocent because of Christ’s work, not their own.
How does the law bring knowledge of sin?
The law sets a clear standard of holiness. When we measure our lives against it, we see where we fall short. That awareness is what Paul calls 'knowledge of sin', a precise recognition of our failure. The law does not condemn us to keep us down; it shows the truth so we can look for a Savior.
Is Paul talking only about the ceremonial law or the whole law?
Most commentators agree that Paul means the moral law, because his list of sins includes things like murder and greed, not just ceremonial breaches. The whole law, every command of God, reveals our sinfulness and cannot justify us.
For pastors & researchers
Greek interlinear, 8 commentaries & word study