Jesus speaks. When He speaks, we listen. Here’s what He had to say about Himself: Then Jesus spoke to them again, saying, “I am the light of the world. He who follows Me shall not walk in darkness, but have the light of life.”
Aw snap! Jesus is saying that He is the light in this dark world. He is the only true light. All other lights are false and this sort of explains Proverbs 13:9 in a way.
If you don’t follow Jesus, you will be lost; stumbling in darkness. This darkness appears to be serious because then Jesus goes on to say “light of life” which seems to say that darkness is death. That’s cool. Double “L” (Light and Life) and double “D” (Darkness and Death).
Essentially, if you want to live…if you want light…you must go to Jesus. There’s no other option. Jesus also mentions that nobody gets to the Father except through Himself. This verse is sort of saying the same thing.