Psalm 78:2

And He answered them, saying, Because it is granted unto you to know the mysteries of the kingdom of heaven, but to them it is not granted:

All these things spake Jesus in parables to the multitudes; and at this time He spake nothing to them without a parable:

And He explained all to his disciples in private.

Treasury of Scripture Knowledge

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

for this reason I speak to them in parables; because though they see, they will not see; and though they hear, they will not hear, nor understand.

And He answered them, saying, Because it is granted unto you to know the mysteries of the kingdom of heaven, but to them it is not granted:

And He explained all to his disciples in private.

and He opened his mouth and taught them, saying,

for there is nothing hidden, which may not be revealed; nor was there any thing concealed, but in order to become manifest.