How do we know salvation is finished?

Salvation is completed through the finished work of Christ, as demonstrated in Hebrews 10:12, which states that after offering one sacrifice for sins forever, Christ sat down at the right hand of the Father. This act of sitting down signifies that His work of redemption is accomplished, eliminating any further need for sacrifice. Philippians 2:9-11 also attests that God has highly exalted Him, confirming His authority and completion of the salvific work. Understanding that Jesus does not stand at our heart's door waiting for our response, but is actively ruling and reigning, secures the assurance that salvation rests solely on His completed work.