How do we know Jesus' claims to be the light of the world are true?

We can know Jesus' claims to be the light of the world are true through several means, including His divine authority, the miracles He performed, and the prophecies of the Old Testament. His use of the phrase 'I am' indicates His divine nature which resonates with the revelation of God to Moses at the burning bush. Furthermore, His fulfillment of prophecies, such as being a light to the Gentiles as declared in Isaiah and the witness of Simeon in the temple, further affirms His identity. Additionally, the transformative effect of Jesus’ presence in the lives of His followers throughout history provides further evidence of His power and truth.