Matthew 13:13-14, 35

That’s why I teach the people using parables, because they think they’re looking for truth, yet because their hearts are unteachable, they never discover it. Although they will listen to me, they never fully perceive the message I speak. The prophecy of Isaiah describes them perfectly: Although they listen carefully to everything I speak, they don’t understand a thing I say. They look and pretend to see, but the eyes of their hearts are closed.

He did this to fulfill the prophecy: I will speak to you in allegories. I will reveal secrets that have been concealed since before the foundation of the world.