Matthew 13:13-15 NIV

[13] This is why I speak to them in parables: “Though seeing, they do not see; though hearing, they do not hear or understand. [14] In them is fulfilled the prophecy of Isaiah: “ ‘You will be ever hearing but never understanding; you will be ever seeing but never perceiving. [15] For this people’s heart has become calloused; they hardly hear with their ears, and they have closed their eyes. Otherwise they might see with their eyes, hear with their ears, understand with their hearts and turn, and I would heal them.’