Romans 3:20

My Notes

What Does Romans 3:20 Mean?

Paul declares the law's limitation: 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.

Therefore — the conclusion of Paul's argument from Romans 1:18 through 3:19. The therefore summarizes everything preceding: all humanity — Gentile (1:18-32) and Jew (2:1-3:8) — is under sin (3:9). The entire human race stands guilty before God. And the conclusion from this universal guilt is: the law cannot fix it.

By the deeds of the law (ex ergon nomou — out of works of law, from law-keeping, through legal performance) — the deeds are the actions the law requires: the commandments kept, the rituals performed, the standards met. The works of the law represent the totality of human effort to achieve right standing through obedience to God's commands.

There shall no flesh (ou pasa sarx — not all flesh, i.e., no flesh whatsoever) be justified (dikaioo — to be declared righteous, to receive the verdict of 'not guilty,' to be acquitted) in his sight (enopion autou — before him, in his presence, by his evaluation) — no flesh. No human being. Not one. The justification — the legal declaration of righteous standing before God — is not achievable through law-keeping. The shall not is absolute: no flesh will ever be justified by works of law. The impossibility is not about effort. It is about the instrument: the law was never designed to justify. It was designed to reveal.

For by the law is the knowledge (epignosis — full recognition, clear awareness, deep understanding) of sin — the law's actual function: making sin known. The law does not remove sin. It identifies sin. The law is a diagnostic tool, not a cure. It shows you what is wrong. It does not fix what is wrong. The knowledge of sin — the clear, unmistakable recognition of your guilt — is what the law produces. Not justification. Knowledge. Not acquittal. Awareness.

The verse establishes the most foundational distinction in Pauline theology: the law diagnoses. Grace heals. The law reveals the disease. The gospel provides the cure. The law says: you are guilty. The gospel says: you are justified — but not by the law. By faith (v.22).

The verse does not say the law is bad. It says the law has a specific function (revealing sin) that is different from what people tried to use it for (achieving justification). The law is a perfect mirror: it shows you exactly what you look like. But a mirror cannot clean your face. It can only show you that your face is dirty.

Reflection Questions

• 1.What does 'no flesh justified by the deeds of the law' establish about the limitation of law-keeping as a means of right standing with God?
• 2.How does the law's actual function (knowledge of sin) differ from what people tried to use it for (justification)?
• 3.Why is the mirror metaphor (the law shows the problem but cannot fix it) helpful for understanding the law's role?
• 4.Where are you still trying to use the law (moral performance, religious effort) to achieve what only grace through faith can provide?

Devotional

By the deeds of the law there shall no flesh be justified in his sight. No flesh. Not some flesh that tries hard enough. Not the flesh that keeps most of the commandments most of the time. No flesh — not one human being, regardless of effort, performance, or religious dedication — will ever be declared righteous before God through law-keeping. The instrument does not produce the result. The law was never designed to justify.

For by the law is the knowledge of sin. This is what the law does: it shows you what is wrong. The law is a mirror — it reflects your condition with perfect accuracy. Every commandment you failed to keep, every standard you fell short of, every requirement you violated — the law identifies all of it. The knowledge is clear, complete, and devastating: you are guilty. The law produced the diagnosis. The law cannot produce the cure.

The law is a perfect diagnostic tool. It tells you exactly what the disease is. It names every symptom. It identifies every pathology. And then it stops — because diagnosis is its function. The law was never meant to heal. It was meant to reveal. And what it reveals is sin — yours, mine, everyone's. The knowledge of sin is the law's product. Justification is not.

The verse is the death of self-righteousness. Every attempt to earn right standing with God through moral performance, religious activity, or commandment-keeping is declared futile — not because the effort is insincere but because the instrument is wrong. You are trying to use a mirror to wash your face. The mirror shows you the dirt. It cannot remove the dirt. The removal requires something the law does not provide: grace through faith (v.22-24).

What are you using to justify yourself before God? Your moral record? Your religious performance? Your obedience to the commands you have managed to keep? Paul says: no flesh will be justified that way. The law shows you the sin. It does not remove the sin. The removal comes from a different source entirely — and that source is described in the verses that follow: the righteousness of God through faith in Jesus Christ.

The mirror is good. The mirror is necessary. But the mirror is not the soap. And the soap is what you need.

Commentary

Trusted original commentary from respected historical Bible scholars and theologians.

Cross References

Related passages throughout Scripture