Matthew 13:35
that it might be fulfilled which was spoken by the prophet, saying, I will open my mouth in parables; I will declare things which have been concealed from the foundation of the world.
Matthew 13:11-15
And he answered and said to them, Because it is given to you to know the mysteries of the kingdom of heaven, but to them it is not given;
Luke 12:3
Whatever, therefore, you have said in the darkness, shall be heard in the light; and what you have spoken to the ear in private rooms, shall be proclaimed on the houses.
2 Corinthians 3:12
Having therefore this hope we use great boldness,