How do we know Christ's reign is essential for salvation?

The necessity for Christ to reign is deeply connected to His role as our Mediator and Savior. Since all salvation is dependent upon His accomplishment of the Father’s will, His reign ensures that it is executed perfectly. In John 17:2, Christ states that He has been given authority to grant eternal life to as many as the Father has given Him, linking His reign directly to the salvation of God’s chosen people. Ephesians 1:20-23 underscores His exaltation and authority over all, making it clear that without His reign, the salvation of the elect cannot be fully realized or completed.