How do we know that the atonement of Christ is sufficient?

The doctrine of definite atonement asserts that Christ died specifically for His people, securing their salvation fully and completely. This is supported by the scripture that indicates Christ's sacrifice was not just a potential provision but an actual accomplishment for those He came to redeem (John 10:14-15). Because His sacrifice meets the requirements of divine justice, those for whom He sacrificed will never be lost. His priesthood is everlasting and unchangeable, affirming the promise that He can save to the uttermost all who come to God through Him (Hebrews 7:24-25). This guarantees that His atonement is effective and sufficient to cleanse us from all unrighteousness.