The dulled heart, the heavy ears, the shut eyes are the sense-bound state of a person who takes the outer world as final and cannot yet feel that his own imagining shapes what he sees. This is not cruelty laid on him from above. It is the sleep God deliberately entered so that man could descend fully into the body of sense before turning and rising again. The blindness is built into the plan, timed to lift at the appointed hour.
The seeing and hearing that would heal is the recognition that imagination is the creative power and that the one who fell asleep behind these masks is God himself. A person stays fat of heart until that recognition wakes in him. Then the eyes open, and he understands he was the sleeper all along.