How do we know that Jesus Christ's atonement is sufficient for salvation?

The sufficiency of Jesus Christ's atonement for salvation is rooted in His perfect life and sacrificial death. According to Romans 5:8, 'But God shows his love for us in that while we were still sinners, Christ died for us.' This verse highlights the depth of His love and the completeness of His work on the cross. Moreover, His resurrection, triumphant over death, affirms that His sacrifice was accepted by the Father, allowing Him to intercede for His people (Hebrews 7:25). Therefore, those who believe in Him can rest assured that their sins are fully atoned for, as He has secured eternal redemption for His elect.