How do we know God's righteousness is imputed to us?

The imputation of righteousness is a fundamental doctrine expressed in Romans 4, where Paul outlines that righteousness was counted to Abraham because of his faith. This principle applies to all believers. When someone believes in Christ, God's righteousness is imputed to him, making him justified before God. This is not a declaration of righteousness that isn't true; rather, it's an acknowledgment of the believer's actual standing in Christ, where Christ’s righteousness is credited as theirs. Thus, through faith, we are genuinely regarded as righteous in God's eyes.