How do we know Christ is the true light?

In John 1:9, Christ is described as the true light that enlightens every man. This indicates His role as the source of spiritual illumination, akin to how the sun provides light and warmth to the world. His light is available to all, transcending social and ethnic boundaries, meaning that both the rich and poor, Jew and Gentile, may come to Him. Even though many choose spiritual darkness, the light of Christ is universally offered and accessible, showing that the fault lies not with Him but with those who reject Him. Thus, the recognition of Christ as the light is not merely an assertion; it reflects His comprehensive influence over all humanity.