How do we know Christ's sacrifice is sufficient for sin?

The Bible asserts that the blood of bulls and goats, including the ashes of the red heifer, could not atone for sin in a definitive sense (Hebrews 9:13-14). In contrast, Paul declares in Romans 5:9 that we are justified by Christ’s blood. This emphasis on Christ being the perfect sacrifice is rooted in His nature as the Son of God, who was sinless and without blemish. Unlike the animal sacrifices, which served merely as types, Christ’s sacrifice was the ultimate fulfillment, providing complete satisfaction for God's justice and securing eternal redemption for His people. Therefore, believers can trust that through faith in Christ's atoning work, their sins are fully and finally washed away.