How do we know that Jesus' sacrifice is sufficient?

The sufficiency of Jesus’ sacrifice is rooted in His unique qualifications as a just and sinless Savior. In Hebrews 4:15, it states that He was tempted in all points like we are, yet without sin, making Him the perfect sacrifice for our sin. He was sent as the propitiation for our sins, satisfying both the justice and love of God (1 John 4:10). Furthermore, the imputation of His righteousness to believers confirms that His sacrifice is complete and covers all that is required for reconciliation with God. Therefore, we trust in His accomplished work rather than any human effort.