How do we know that Jesus's sacrifice is sufficient for our sins?

The sufficiency of Christ's sacrifice is rooted in the doctrine of substitutionary atonement, which holds that Jesus bore our sins in His own body on the cross, as articulated in 1 Peter 2:24. His suffering and death appeased God's justice, fulfilling the requirements of the law for those who believe in Him. Furthermore, His resurrection serves as the ultimate validation that His sacrifice was accepted, allowing for the redemption of His people from their sins. In essence, through Christ's atoning work, we are eternally secured and justified before God, emphasizing the grace underpinning our salvation. This assurance provides believers with confidence in the power of His blood to cleanse us from all unrighteousness.