Matthew 13:35
that it might be fulfilled which was spoken through the prophet, saying, "I will open My mouth in parables; I will utter things hidden from the foundation of the world."
Matthew 13:11-15
And He, answering, said to them, "Because to you it has been given to know the mysteries of the Kingdom of Heaven, but to them it has not been given.
Luke 12:3
Wherefore, whatsoever ye said in the darkness shall be heard in the light; and what ye spake in the ear in the inner chambers shall be proclaimed upon the housetops.
2 Corinthians 3:12
Having, therefore, such hope, we use great boldness of speech;