This episode starts with the healing of the blind man, who had been born blind. The Pharisees didn't believe and didn't want anyone else to believe. 

They excommunicated the man because he was healed on the Sabbath and he was telling people about his healing.

Jesus said those who say they see, really are blind themselves.

Finally, in chapter 10, Jesus tells them all that He is the Good Shepherd and those who hear Him and obey Him, are His sheep.

He came to do the works of the Father. He told them, if they didn't believe Him and what He said, believe the works, because the Father is in Him, and He in Him.