3.19- He thinks he knows it all does not know what he needs to know.

3.19-

Arrogant religious "know it alls " are fools whose mouth is their undoing. They don't think God uses people who work on the Sabbath. They think a child born blind must have sinful parents or must have been born steeped in sin. Their view of religion is to judge where others are wrong. When God opens the eyes of our hearts, by His mercy and grace. We know less than we knew before because we become more modest before God, one thing we do know is that we were blind but now we see.
God help us to concentrate on turning on lights instead of cursing the darkness. John 9.

John 9.
¹³ They brought to the Pharisees the man who had been blind. ¹⁴ Now the day on which Jesus had made the mud and opened the man’s eyes was a Sabbath. ¹⁵ Therefore the Pharisees also asked him how he had received his sight. “He put mud on my eyes,” the man replied, “and I washed, and now I see.”
¹⁶ Some of the Pharisees said, “This man is not from God, for he does not keep the Sabbath.”
But others asked, “How can a sinner perform such signs?” So they were divided.
¹⁷ Then they turned again to the blind man, “What have you to say about him? It was your eyes he opened.”
The man replied, “He is a prophet.”
¹⁸ They still did not believe that he had been blind and had received his sight until they sent for the man’s parents. ¹⁹ “Is this your son?” they asked. “Is this the one you say was born blind? How is it that now he can see?”
²⁰ “We know he is our son,” the parents answered, “and we know he was born blind. ²¹ But how he can see now, or who opened his eyes, we don’t know. Ask him. He is of age; he will speak for himself.” ²² His parents said this because they were afraid of the Jewish leaders, who already had decided that anyone who acknowledged that Jesus was the Messiah would be put out of the synagogue. ²³ That was why his parents said, “He is of age; ask him.”
²⁴ A second time they summoned the man who had been blind. “Give glory to God by telling the truth,” they said. “We know this man is a sinner.”
²⁵ He replied, “Whether he is a sinner or not, I don’t know. One thing I do know. I was blind but now I see!”