How do we know that Jesus' sacrifice was sufficient?

The sufficiency of Christ's sacrifice is affirmed through numerous scriptural declarations. In Hebrews 7:27, it states that He offered Himself once for all, unlike the high priests who needed to offer daily sacrifices for their own sins and those of the people. His sacrifice was perfect, meeting divine justice, which is further demonstrated by His resurrection. In Romans 4:25, we read how He was raised for our justification, proving that His death was indeed sufficient for the atonement of our sins. The successful completion of His work on the cross—expressed in John 19:30 when He declared 'It is finished'—confirms that the penalty for sin has been fully paid, and believers are now free from the law's condemnation.