John 11:9-10
"Are there not twelve hours in the day?" replied Jesus. "If any one walks in the daytime, he does not stumble--because he sees the light of this world.
John 12:35
"Yet a little while," He replied, "the light is among you. Be faithful to the light that you have, for fear darkness should overtake you; for a man who walks in the dark does not know where he is going.
John 12:40
"He has blinded their eyes and made their minds callous, lest they should see with their eyes and perceive with their minds, and should turn, and I should heal them."
1 John 2:11
But he who hates his brother man is in darkness and is walking in darkness; and he does not know where he is going--because the darkness has blinded his eyes.