In the closing verses of John 9 Jesus says that He had come into the world that those who do not see might see, and so that those who do see might be made blind. That sounds a little confusing without stopping to think through it, which might be part of the reason why the Pharisees asked him if they were blind, too (v. 40).
Jesus replies by saying “If you were blind, you would have no sin; but now you say, ‘We see.’ Therefore your sin remains” (v. 41). What is the point He is driving at here?
The Pharisees thought that they had everything figured out and that there wasn’t much that anybody could teach them. The blind man, on the other hand, knew that he had a lot to learn, and spiritually speaking, he was blind.
If we, like the Pharisees, think that we know it all, them we too will be blind to the spiritual truths God sets before us in Scripture. But if we come to God like the blind man, with an open heart and mind, ready to learn, then we will be able to see God’s truth more clearly.