3 Bible Verses about Incredulity

Now Thomas, one of the twelve, who is called Didymus, the twin, was not with them when Jesus came.

They brought him to the Pharisees, who had before been blind. (Now it was the sabbath-day when Jesus made the mud, and opened his eyes.) The Pharisees therefore questioned him again, How he had received sight? And he told them, He put mud upon my eyes, and I washed, and do see.read more.
Then said certain of the Pharisees, This man is not from God, because he observeth not the sabbath. Others said, How is it possible for a wicked man to do such miracles? And there was a division among them. They say to the blind man again, What sayest thou of him? that he opened thine eyes? Then he replied, That he is a prophet. Then the Jews did not believe that he had been blind, and received sight, until that they had called the parents of him who had received sight. And they questioned them, saying, Is this your son, of whom ye say, that he was born blind? how then doth he now see? His parents answered them and said, We know that this is our son, and that he was born blind: but how he now seeth, we know not; or who hath opened his eyes, we know not: he is of age; ask him: he himself will tell you about it. So spake his parents, because they were afraid of the Jews: for the Jews had already come to a resolution, that if any person acknowledged him Messiah, he should be excluded the synagogue. Therefore said his parents, He is of age; ask him. The second time therefore they called the man who had been blind, and said unto him, Give the glory to God: we know that this man is a sinner. Then answered he and said, Whether this man be a sinner, I know not: one thing I do know, that, whereas I was blind, now I see. Then said they to him again, What did he to thee? how opened he thine eves? He answered them, I have already told you, and ye did not hearken: why do ye wish to hear it again? will ye also become his disciples? Then they reviled him, and said, Thou art his disciple, but we are the disciples of Moses. We know that God spake to Moses: but we know nothing of this man, whence he is. The man replied, and said to them, Now herein is something very surprising, that you know not whence he is, though he hath opened my eyes. Now we know that God doth not hearken to sinners: but if any man be a devout worshipper, and doeth his will, him he heareth. From the creation of the world hath it never been heard, that any man opened the eyes of one born blind. If this man were not from God, he could not do any thing. They answered and said unto him, Thou wast wholly born in sins, and dost thou teach us? And they cast him out. Jesus heard that they had cast him out; and finding him, said to him, Believest thou in the Son of God? The man answered and said, Who is he, Sir, that I might believe on him? Then said Jesus him, Thou hast even seen him, and he that is now talking with thee is the very person. Then he said, Lord, I believe: and worshipped him. And Jesus said, For judgment I am come into this world, that they who see not may see; and they who see become blind. And some of the Pharisees who were with him heard these things, and said to him, Are we blind also? Jesus said to them, If ye were blind, ye should not have had sin: but now ye say, We see; therefore your sin is permanent.

But we think it highly proper to hear from thee what thy sentiments are; for indeed as to this sect, it is well known to us that everywhere it meets with opposition. Then having fixed a day with him, still more of them came to him at his lodging, to whom bearing his testimony, he set forth the kingdom of God, and persuaded them of the things relating to Jesus, both out of the law of Moses and the prophets, from morning until evening: and some were convinced by the things which were spoken, but others continued in their unbelief.read more.
So being divided in sentiment among themselves, they broke up, Paul adding one word, That well had the Holy Ghost spoken by Isaiah the prophet unto our fathers, saying, Go to this people, and say, "In hearing ye shall hear, and shall not understand; and seeing ye shall see, yet in nowise perceive. For the heart of this people is waxed gross, and with their ears they are thick of hearing, and their eyes have they shut; lest at any time they should see with their eyes, and hear with their ears, and understand with their hearts, and become converts, and I should heal them." Be it known therefore unto you, that to the Gentiles is the salvation of God sent, and they will hear. And when he had thus spoken, the Jews went away, and had much disputing among themselves.