This is the judgment, that the light has come into the world, and men loved the darkness rather than the light; for their works were evil.

 John took that old story and used it as a kind of parable of Jesus. He says: "The serpent was lifted up; men looked at it; their thoughts were turned to God; and by the power of that god in whom they trusted they were healed. Even so Jesus must be lifted up; and when men turn their thoughts to him, and believe in him, they too will find eternal life." 