How do we know that Jesus truly fulfilled the law?

Jesus Christ fulfilled the law through His active obedience, living a sinless life in accordance with God's holy requirements. While we, as human beings, are unable to keep the law due to our sinful nature, Christ, being both fully divine and fully human, successfully obeyed each command. This perfect obedience was crucial because it established His righteousness, which is imputed to believers. Without His fulfillment of the law, we would remain under the curse of sin, as the Scriptures state, 'Cursed is everyone who does not continue in all things written in the book of the law to do them.' Therefore, Christ's life of active obedience is integral to the gospel, demonstrating that through His righteousness, we are justified before God.