Matthew 13:34
Jesus told the crowds all these things in parables. He did not tell them anything without using a parable.
Mark 4:33-34
With many other parables like these, Jesus kept speaking his message to them according to their ability to understand.
John 16:25
"I have said these things to you in figurative language. The time is coming when I will no longer speak to you in figurative language, but will tell you plainly about the Father.
Matthew 13:13
That's why I speak to them in parables, because "they look but don't see, and they listen but don't hear or understand.'