You know, I disagree with scripture being posted without context because it can imply things that are simply not true, or are so skewed that the wrong meaning is presented as if it was fact.
Please allow me demonstrate with the scripture you quoted.....
What was the background to Jesus’ statement? He had just given another illustration......
Mark 4:3-9....
“Listen. Look! The sower went out to sow. 4 As he was sowing, some seeds fell alongside the road, and the birds came and ate them up. 5 Others fell on rocky ground where there was not much soil, and they immediately sprang up because the soil was not deep. 6 But when the sun rose, they were scorched, and they withered because they had no root. 7 Other seeds fell among the thorns, and the thorns came up and choked them, and they yielded no fruit. 8 But others fell on the fine soil, and growing up and increasing, they began to yield fruit, and they were bearing 30, 60, and 100 times more.” 9 Then he added: “Let the one who has ears to listen, listen.”
Remember that Jesus’ audience was exclusively Jewish, because they were the ones to whom he was sent.....not to the scribes and Pharisees, (whom he roundly denounced) but to “the lost sheep of the house of Israel”. (Matthew 15:24) You have to understand why those sheep were “lost”....and why Jesus was “sent” to them.
“10 Now when he was alone, those around him with the Twelve began questioning him about the illustrations. 11 He said to them: “To you the sacred secret of the Kingdom of God has been given, but to those outside all things are in illustrations, 12 so that, though looking, they may look and still not see, and though hearing, they may hear and still not get the sense of it; nor will they ever turn back and receive forgiveness.”
Who was Jesus talking to, as opposed to who he was talking about? Who was the “you” and who were the “they”?
Many of the Jewish people came to hear Jesus speak and to experience his miracles first hand. But the religious leaders and those whom they were able to influence, were not one bit impressed by his discourses or his miracles whom they attributed to “Beelzebub”. To them, he was nothing but an apostate trouble maker who needed to be stopped. They did not have ‘ears to listen’.
When he said to those who asked about the meaning of the parable, he said.....
“To you the sacred secret of the Kingdom of God has been given, but to those outside all things are in illustrations, 12 so that, though looking, they may look and still not see, and though hearing, they may hear and still not get the sense of it; nor will they ever turn back and receive forgiveness.”
Do you see who he was talking to? Do you see who he was talking about? Who had “ears to listen” and who didn’t?
Knowing the background to Jesus’ statement, you will understand how many times God had sent his prophets to his rebellious people, and each time they were met with resistance and a refusal to be corrected. Jesus called them, “
the killer of the prophets and stoner of those sent to her”....(Matthew 23:37)....so against that backdrop, Jesus’ words become clear.....to those who came to hear and who got the sense of his illustrations, the “sacred secret” of the Kingdom of God was revealed.....but to those who heard but found nothing of value in his sermons, “they” would never get the sense of any of his teachings because they were of the same ilk as those who had been disobedient to God, being influenced by their corrupt, spiritually deaf, religious leaders for centuries.
These ones were only looking for things to criticize because Jesus’ speech and actions did not compare with what they had been led to believe concerning their Messiah. Their leaders had given the people a false expectation about what their Messiah would be....and do. Those false expectations are still in place to this day.....and their Messiah has never put in an appearance. These are the ones who got nothing out of his teachings and in the process, (because their spiritual eyes and ears were closed) condemned themselves.
When Gentiles were added to the Christian followers of Jesus, (Acts 15:14) the response of people would still be basically the same.....there would still be a “you” and “they”....’good soil and bad soil’.......“sheep and goats”....right to the end.
In verses 14-19 he gave them a detailed explanation of the meaning of the illustration.....and it made perfect sense to those who were open to his message. This is also true today.