4 Bible Verses about Incredulity

Now Thomas, one of the twelve, named Didymus, was not with them when Jesus came.

See, I will put the wool of a sheep on the grain-floor; if there is dew on the wool only, while all the earth is dry, then I will be certain that it is your purpose to give Israel salvation by my hand as you have said. And it was so: for he got up early on the morning after, and twisting the wool in his hands, he got a basin full of water from the dew on the wool. Then Gideon said to God, Do not be moved to wrath against me if I say only this: let me make one more test with the wool; let the wool now be dry, while the earth is covered with dew.read more.
And that night God did so; for the wool was dry, and there was dew on all the earth round it.

They took him before the Pharisees--this man who had been blind. Now the day on which the earth was mixed by Jesus and the man's eyes were made open was the Sabbath. So the Pharisees put more questions to him about how his eyes had been made open. And he said to them, He put earth on my eyes, and I had a wash and am able to see.read more.
Then some of the Pharisees said, That man has not come from God, for he does not keep the Sabbath. Others said, How is it possible for a sinner to do such signs? So there was a division among them. Again they said to the blind man, What have you to say about him for opening your eyes? And he said, He is a prophet. Now the Jews had no belief in the statement that he had been blind and was now able to see, till they sent for the father and mother of the man whose eyes had been made open, And put the question to them, saying, Is this your son, of whom you say that he was blind at birth? how is it then that he is now able to see? In answer his father and mother said, We are certain that this is our son and that he was blind at birth: But how it is he is now able to see, or who made his eyes open, we are not able to say: put the question to him; he is old enough to give an answer for himself. They said this because of their fear of the Jews: for the Jews had come to an agreement that if any man said that Jesus was the Christ he would be put out of the Synagogue. That was the reason why they said, He is old enough; put the question to him. So they sent a second time for the man who had been blind and they said to him, Give glory to God: it is clear to us that this man is a sinner. He said in answer, I have no knowledge if he is a sinner or not, but one thing I am certain about; I was blind, and now I see. Then they said to him, What did he do to you? how did he give you the use of your eyes? His answer was: I have said it before, but your ears were shut: why would you have me say it again? is it your desire to become his disciples? And they were angry with him and said, You are his disciple, but we are disciples of Moses. We are certain that God gave his word to Moses: but as for this man, we have no knowledge where he comes from. The man said in answer, Why, here is a strange thing! You have no knowledge where he comes from though he gave me the use of my eyes. We have knowledge that God does not give ear to sinners, but if any man is a worshipper of God and does his pleasure, to him God's ears are open. In all the years nobody has ever before seen the eyes of a man blind from birth made open. If this man did not come from God he would be unable to do anything. Their answer was: You came to birth through sin; do you make yourself our teacher? And they put him out of the Synagogue. It came to the ears of Jesus that they had put him out, and meeting him he said, Have you faith in the Son of man? He said in answer, And who is he, Lord? Say, so that I may have faith in him. Jesus said to him, You have seen him; it is he who is talking to you. And he said, Lord, I have faith. And he gave him worship. And Jesus said, I came into this world to be a judge, so that those who do not see may see, and those who see may become blind. These words came to the ears of the Pharisees who were with him and they said to him, Are we, then, blind? Jesus said to them, If you were blind you would have no sin: but now that you say, We see; your sin is there still.

But we have a desire to give hearing to your opinion: for as to this form of religion, we have knowledge that in all places it is attacked. And when a day had been fixed, they came to his house in great numbers; and he gave them teaching, giving witness to the kingdom of God, and having discussions with them about Jesus, from the law of Moses and from the prophets, from morning till evening. And some were in agreement with what he said, but some had doubts.read more.
And they went away, for there was a division among them after Paul had said this one thing: Well did the Holy Spirit say by the prophet Isaiah to your fathers, Go to this people and say, Though you give ear, you will not get knowledge; and seeing, you will see, but the sense will not be clear to you: For the heart of this people has become fat and their ears are slow in hearing and their eyes are shut; for fear that they might see with their eyes and give hearing with their ears and become wise in their hearts and be turned again to me, so that I might make them well. Be certain, then, that the salvation of God is sent to the Gentiles, and they will give hearing. []