Matthew 13:13-14

13This is the reason I speak to the crowds in parables: because while [having the power of] seeing they do not see, and while [having the power of] hearing they do not hear, nor do they understand and grasp [spiritual things].

14In them the prophecy of Isaiah is being fulfilled, which says, ‘You will hear and keep on hearing, but never understand; And you will look and keep on looking, but never comprehend;