How do we know Christ's work was sufficient for salvation?

The sufficiency of Christ's work for salvation is firmly supported by His perfect obedience and atoning sacrifice. In John 19:30, Christ proclaimed 'It is finished,' indicating the completion of His mission to atone for the sins of His people. His life, characterized by perfect obedience to the Father's law and His sacrificial death signifies that all the requirements for redemption have been fulfilled. This assurance promotes trust in Him for salvation, as He accomplished everything necessary for reconciliation between God and humankind.