'Secret' in the Bible

I will give you the treasures of darkness, and hidden riches of secret places, that you may know that it is I, Yahweh, who call you by your name, even the God of Israel.

I have not spoken in secret, in a place of the land of darkness. I didn't say to the seed of Jacob, 'Seek me in vain.' I, Yahweh, speak righteousness. I declare things that are right.

"Come near to me and hear this: "From the beginning I have not spoken in secret; from the time that it was, there am I." Now the Lord Yahweh has sent me, with his Spirit.

who sit among the graves, and lodge in the secret places; who eat pig's flesh, and broth of abominable things is in their vessels;