Matthew 13:13-14

This 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]. In 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