Psalm 78:2

I will declare wise sayings;
I will speak mysteries from the past—

I turn my ear to a proverb;
I explain my riddle with a lyre.

for understanding a proverb or a parable,
the words of the wise, and their riddles.

He answered them, “Because the secrets of the kingdom of heaven have been given for you to know, but it has not been given to them.

Jesus told the crowds all these things in parables, and He would not speak anything to them without a parable,

And He did not speak to them without a parable. Privately, however, He would explain everything to His own disciples.

Treasury of Scripture Knowledge

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

I turn my ear to a proverb;
I explain my riddle with a lyre.

For this reason I speak to them in parables, because looking they do not see, and hearing they do not listen or understand.

for understanding a proverb or a parable,
the words of the wise, and their riddles.

He answered them, “Because the secrets of the kingdom of heaven have been given for you to know, but it has not been given to them.

And He did not speak to them without a parable. Privately, however, He would explain everything to His own disciples.

Then He began to teach them, saying:

For nothing is concealed except to be revealed, and nothing hidden except to come to light.