How do we know that Christ's work is complete?

The affirmation that Christ's work is complete is firmly established in the statement 'It is finished' (John 19:30), which signifies that all the demands of the law were fulfilled in Him. The New Testament emphasizes that salvation is not contingent upon human effort but solely through Christ's atoning sacrifice. For example, Romans 10:4 states, 'For Christ is the end of the law for righteousness to everyone who believes.' This is a critical aspect of sovereign grace doctrine, portraying that God’s plan for redemption was established from eternity past and executed entirely through the work of His Son. It assures believers that their salvation does not depend on their works but rests upon Christ's finished work.