Psalm 78:2

"To you," answered Jesus, "the knowledge of the hidden truths of the Kingdom of Heaven has been imparted, but not to those.

Of all this Jesus spoke to the crowd in parables; indeed to them he used never to speak at all except in parables,

And to them he never used to speak except in parables; but in private to his own disciples he explained everything.

Treasury of Scripture Knowledge

I will open my mouth in a parable: I will utter dark sayings of old:

That is why I speak to them in parables, because, though they have eyes, they do not see, and though they have ears, they do not hear or understand.

"To you," answered Jesus, "the knowledge of the hidden truths of the Kingdom of Heaven has been imparted, but not to those.

And to them he never used to speak except in parables; but in private to his own disciples he explained everything.

And he began to teach them as follows:

Nothing is hidden unless it is some day to come to light, nor was anything ever kept hidden but that it should some day come into the light of day.