How do we know Jesus' sacrifice for sin is sufficient?

The sufficiency of Jesus' sacrifice is demonstrated through Scripture, notably in Hebrews 10:12, which states that 'this man, after he had offered one sacrifice for sins forever, sat down by the right hand of God.' His single, perfect offering dealt with sin completely, as confirmed by the notion that He has perfected forever those who are sanctified. This doctrine assures believers that they are fully redeemed by Christ's finished work on the cross, without the need for any additional sacrifices. Such an understanding encourages a deep sense of gratitude and worship toward our Savior, who has triumphed over sin and death.