The claim that Jesus makes in verse 12 is an uncompromising one. He is the light of the world who alone reveals the Father of light. There is however a wonderful invitation inherent in Jesus claim, and that invitation is not based on anything we might do other that professing that Jesus is Lord, that invitation is that
If you follow me, whoever you are, you won’t have to walk in darkness, because you will have the light that leads to life.”