How do we know Christ's perfect righteousness is sufficient for salvation?

Christ's righteousness is sufficient for salvation because it meets all the requirements of God's holy law. Romans 10:4 states that Christ is the end of the law for righteousness to everyone who believes. The law demanded perfect obedience, which we failed to deliver, but Christ, being sinless, fulfilled the law for us. His substitutionary death satisfied God's justice, allowing God to be both just and the justifier of those who believe (Romans 3:26). Therefore, our hope of salvation rests entirely on Christ's finished work rather than our own efforts.