How do we know that Christ's light is true?

The truth of Christ's light is substantiated through both His miraculous works and His fulfillment of Old Testament prophecies. For instance, John 1:4 states, 'In Him was life, and the life was the light of men.' His life and teachings provide clarity about righteousness, sin, and redemption. Additionally, fulfillment of prophetic writings, such as the ones found in Isaiah 9:2, indicates that 'the people that walked in darkness have seen a great light.' This is a clear reference to Jesus as the Messiah, confirming that His light is not only true but essential for salvation and understanding of God's glory.