Matthew 13:13-14
"This is why I speak to them in parables, because seeing they do not see, and hearing they do not hear, nor do they understand.
Matthew 13:35
in fulfilment of the word spoken by the prophet, I will open my mouth in parables, I will utter things kept secret since the foundation of the world."
Mark 4:33-34
With many such illustrations Jesus used to tell his message to people as far as they were able to receive it;
1 Corinthians 13:12
For now we see as in a mirror, and are baffled, but then face to face; now I know in fragments, but then shall I understand even as I also have been understood.