How do we know that Jesus Christ is the faithful witness?

Jesus Christ is described as the faithful witness in Revelation 1:5 because He perfectly came from God to reveal His nature and purposes to humanity. No one can know the Father except through the Son, as only He has the authority to unveil the truth of God. He embodies the message of salvation — stating, 'I am the way, the truth, and the life,' confirming His role as the mediator between God and man. His witness is not only reliable but essential for understanding divine truth, giving believers confidence in their relationship with the Father.