What is the meaning of Matthew 13:13-15?

13 Therefore speak I to them in parables: because they seeing see not; and hearing they hear not, neither do they understand. 14 And in them is fulfilled the prophecy of Esaias, which saith, By hearing ye shall hear, and shall not understand; and seeing ye shall see, and shall not perceive: 15 For this people’s heart is waxed gross, and their ears are dull of hearing, and their eyes they have closed; lest at any time they should see with their eyes, and hear with their ears, and should understand with their heart, and should be converted, and I should heal them. (Matthew 13:13-15 KJV)

William Burkitt’s Commentary

These words of our blessed Saviour, as I conceive, have a peculiar reference and relation to the Pharisees, who attended upon Christ’s ministry, not with an honest simplicity of mind, to be instructed by it, but to carp and cavil at it. Our Saviour tells them, he had formerly spoken things very plainly and clearly to them, and also wrought miracles before them, to convince them of the divinity of his person and of the verity of his doctrine: but they would not believe either his person or his doctrine to be from God; and therefore he would now speak to them in dark parables, that they may be judicially blinded; they sinfully shut their eyes against the clearest light, and said they would not see; and now Christ closes their eyes judicially, and says they shall not see.

Learn hence, To acknowledge the divine justice, which speaks darkly to them that despise the light: such who see and yet see not, they shall see the shell but not the kernel; they shall hear the parable, but not understand the spiritual sense and meaning of it. When wilful blindness of mind is added to natural blindness, it is a just and righteous thing with God to superadd judicial blindness, and give them obstinancy of heart, his curse unto them.