Psalms 78:2

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

Matthew 13:35

That it might be fulfilled which was spoken by the prophet, saying, I will open my mouth in parables; I will utter things which have been kept secret from the foundation of the world.

Numbers 12:8

With him will I speak mouth to mouth, even apparently, and not in dark speeches; and the similitude of the LORD shall he behold: wherefore then were ye not afraid to speak against my servant Moses?

Numbers 23:7

And he took up his parable, and said, Balak the king of Moab hath brought me from Aram, out of the mountains of the east, {saying}, Come, curse me Jacob, and come, defy Israel.

2 Corinthians 3:12

Seeing then that we have such hope, we use great plainness of speech: {plainness: or, boldness}

Matthew 13:11-15

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

Luke 12:3

Therefore whatsoever ye have spoken in darkness shall be heard in the light; and that which ye have spoken in the ear in closets shall be proclaimed upon the housetops.

Proverbs 1:6

To understand a proverb, and the interpretation; the words of the wise, and their dark sayings. {the interpretation: or, an eloquent speech}