Psalm 78:2

And he answered them, "To you it has been given to know the secrets of the kingdom of heaven, but to them it has not been given.

All these things Jesus spoke to the crowd in parables; and without a parable he did not speak to them.

But without a parable he did not speak to them. And when they were alone, he explained everything to his own disciples.

Treasury of Scripture Knowledge

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

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.

And he answered them, "To you it has been given to know the secrets of the kingdom of heaven, but to them it has not been given.

But without a parable he did not speak to them. And when they were alone, he explained everything to his own disciples.

And he opened his mouth and taught them, saying:

For there is nothing hidden, except to be revealed; nor is anything secret, but that it should come to light.