How do we know Christ is the key to salvation?

In Revelation 3:7, Christ is described as having 'the key of David,' symbolizing His authority and the exclusive role He plays in salvation. This imagery is rooted in Isaiah 22:22, which shows that a key allows access, signifying that Christ alone unlocks the way to the Father and the Kingdom of God. Additionally, Jesus asserts in John 14:6, 'I am the way, the truth, and the life; no one comes to the Father except through me,' further affirming His unique position as the key to salvation. This underscores the necessity of faith in Christ, as He is the only means by which we can enter into eternal life.