How do we know that Christ's righteousness is necessary for salvation?

The necessity of Christ's righteousness for salvation is fundamentally rooted in the reality of human sinfulness and inadequacy. Romans 3:20 states plainly that 'by works of the law no human being will be justified in his sight.' This underscores that our attempts at righteousness are futile. Instead, Christians believe that it is the imputed righteousness of Christ, acquired through faith in Him, that justifies believers before God. This theme is consistently affirmed throughout scripture, emphasizing that reliance on Christ's righteousness is our only hope for eternal life and justification.