Why is the fulfillment of the law seen as important in Christian theology?

In the Reformed understanding, the fulfillment of the law by Christ is vital because it establishes the basis for the believer’s righteousness. Noah, described as a just man, points to the need for righteousness that comes through Christ’s obedience. Romans 5:19 says, 'For as by one man's disobedience many were made sinners, so by the obedience of one shall many be made righteous.' The law’s demands are fully met by Christ, who lived a perfect life, emphasizing that believer's acceptance before God does not depend on their own works but entirely on Christ’s righteousness imputed to them by faith. This fulfillment brings profound rest and assurance to believers, freeing them from the burden of the law.