How do we know Jesus Christ's work is finished?

Jesus Christ's declaration that 'It is finished' underscores the completion of His redemptive work. In Colossians 1:19-20, it states that God was pleased for all fullness to dwell in Christ, who made peace through His blood on the cross. This signifies that all that is necessary for our salvation has been perfectly accomplished, and there is nothing left for us to do to gain His favor. Additionally, Hebrews 4:3 affirms that His works were finished from the foundation of the world, indicating that God’s plan of salvation was set into motion long before we existed.