The law cannot justify us because it demands perfection, which no one can attain, highlighting our need for Christ's righteousness.
Paul clearly states in Galatians 3:11 that no man is justified by the law in the sight of God; instead, it is evident that the just shall live by faith. This highlights the impossibility of attaining righteousness through our own works under the law. The law reveals our sinful nature and leads us to despair of self-righteousness, ultimately pointing us to Christ, who fulfills the law on our behalf. Therefore, the law serves to demonstrate our need for grace and reveals that justification comes solely through faith in Jesus Christ, apart from works of the law.
Commentary