"You shall indeed hear but never understand, and you shall indeed see but never perceive. For this people's heart has grown dull, and their ears are heavy of hearing, and their eyes they have closed, lest they should perceive with their eyes, and hear with their ears, and understand with their heart, and turn for me to heal them." (Isaiah 6:9-10).
Quoting Jesus:
"For judgment I came into this world, that those who do not see may see, and that those who see may become blind." (John 9:39).