Mark 4:11

He said to them, “The mystery of the kingdom of God has been given to you (who have teachable hearts), but those who are outside (the unbelievers, the spiritually blind) get everything in parables. So that they will continually look but not see, and they will continually hear but not understand, otherwise they might turn (from their rejection of the truth) and be forgiven.  

At some point, the truth was presented and rejected by the one that only receives parables. The truth from God didn’t line up with their interpretation of how life should be. This person will keep looking for their truth and never understand or hear the truth of God. Yet their hearts long for the truth they rejected, and repentance is the only way back to God.