Although they had seen Jesus perform so many miracles, they wouldn't believe in him.
In this way the words of the prophet Isaiah came true: "Lord, who has believed our message? To whom has the Lord's power been revealed?"
So the people couldn't believe because, as Isaiah also said,
"God blinded them and made them close-minded so that their eyes don't see and their minds don't understand. And they never turn to me for healing!"
Isaiah said this because he had seen Jesus' glory and had spoken about him.
Many rulers believed in Jesus. However, they wouldn't admit it publicly because the Pharisees would have thrown them out of the synagogue.
They were more concerned about what people thought of them than about what God thought of them.
Then Jesus said loudly, "Whoever believes in me believes not only in me but also in the one who sent me.
Whoever sees me sees the one who sent me.
I am the light that has come into the world so that everyone who believes in me will not live in the dark.
If anyone hears my words and doesn't follow them, I don't condemn them. I didn't come to condemn the world but to save the world.
Those who reject me by not accepting what I say have a judge appointed for them. The words that I have spoken will judge them on the last day.
I have not spoken on my own. Instead, the Father who sent me told me what I should say and how I should say it.
I know that what he commands is eternal life. Whatever I say is what the Father told me to say."