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Jesus spoke in parables to discern between those who were willing to serve God and those who were not.
Malachi 3:18 Then shall ye return, and discern between the righteous and the wicked, between him that serveth God and him that serveth him not.
Matthew 13:10 And the disciples came, and said unto him, Why speakest thou unto them in parables? 11 He answered and said unto them, Because it is given unto you to know the mysteries of the kingdom of heaven, but to them it is not given. 12 For whosoever hath, to him shall be given, and he shall have more abundance: but whosoever hath not, from him shall be taken away even that he hath. 13 Therefore speak I to them in parables: because they seeing see not; and hearing they hear not, neither do they understand. 14 And in them is fulfilled the prophecy of Esaias, which saith, By hearing ye shall hear, and shall not understand; and seeing ye shall see, and shall not perceive:
Isaiah 6:9 And he said, Go, and tell this people, Hear ye indeed, but understand not; and see ye indeed, but perceive not. 10 Make the heart of this people fat, and make their ears heavy, and shut their eyes; lest they see with their eyes, and hear with their ears, and understand with their heart, and convert, and be healed.
Matthew 13:34 All these things spake Jesus unto the multitude in parables; and without a parable spake he not unto them: 35 That it might be fulfilled which was spoken by the prophet, saying, I will open my mouth in parables; I will utter things which have been kept secret from the foundation of the world.
Psalms 78:2 I will open my mouth in a parable: I will utter dark sayings of old:
Mark 4:11 And he said unto them, Unto you it is given to know the mystery of the kingdom of God: but unto them that are without, all these things are done in parables: 12 That seeing they may see, and not perceive; and hearing they may hear, and not understand; lest at any time they should be converted, and their sins should be forgiven them.
Luke 8:10 And he said, Unto you it is given to know the mysteries of the kingdom of God: but to others in parables; that seeing they might not see, and hearing they might not understand.
John 10:6 This parable spake Jesus unto them: but they understood not what things they were which he spake unto them.
John 8:43 Why do ye not understand my speech? even because ye cannot hear my word.
I hope you have found this helpful.