Psalm 78:2

He answered and said, Because to you it hath been given to know the mysteries of the kingdom of heaven; but to them it hath not been given.

All these things Jesus spoke to the multitudes in parables, and without a parable he spoke nothing to them;

But without a parable he did not speak to them; but in private he explained all things to his own disciples.

Treasury of Scripture Knowledge

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

Therefore I speak to them in parables, because seeing they see not, and hearing they hear not, nor understand.

He answered and said, Because to you it hath been given to know the mysteries of the kingdom of heaven; but to them it hath not been given.

But without a parable he did not speak to them; but in private he explained all things to his own disciples.

And he opened his mouth, and taught them, saying:

For there is nothing secret, unless to be made known; nor was any thing hidden, but that it should come to light.