Jesus had done all these miraculous signs in front of them. But they still would not believe in him.
This happened as Isaiah the prophet had said it would. He had said, "Lord, who has believed what we've been saying? Who has seen the Lord's saving power?" (Isaiah 53:1)
For this reason, they could not believe. As Isaiah says in another place,
"The Lord has blinded their eyes. He has closed their minds. So they can't see with their eyes. They can't understand with their minds. They can't turn to the Lord. If they could, he would heal them." (Isaiah 6:10)
Isaiah said this because he saw Jesus' glory and spoke about him.
At the same time that Jesus did those miracles, many of the leaders believed in him. But because of the Pharisees, they would not admit they believed. They were afraid they would be thrown out of the synagogue.
They loved praise from people more than praise from God.
Then Jesus cried out, "Anyone who believes in me does not believe in me only. He also believes in the One who sent me.
When he looks at me, he sees the One who sent me.
"I have come into the world to be a light. No one who believes in me will stay in darkness.
"I don't judge a person who hears my words but does not obey them. I didn't come to judge the world. I came to save it.
But there is a judge for anyone who does not accept me and my words. The very words I have spoken will judge him on the last day.
"I did not speak on my own. The Father who sent me commanded me what to say. He also told me how to say it.
I know that his command leads to eternal life. So everything I say is just what the Father has told me to say."