How do we know that God's work is finished?

The completion of God's saving work is emphatically declared by Jesus Christ on the cross when He said, 'It is finished' (John 19:30). This statement signifies that the full debt of sin was paid and that God's plan of salvation was accomplished. Furthermore, according to Hebrews 4:3, the works were finished from the foundation of the world, indicating that what Christ accomplished in history had already been eternally established in the mind and will of God. This underscores the sovereign grace perspective that salvation is both certain and complete in Christ.