'Secret' in the Bible

The secret which has been kept from all times and generations, but has now been made clear to his saints,

To whom God was pleased to give knowledge of the wealth of the glory of this secret among the Gentiles, which is Christ in you, the hope of glory:

So that their hearts may be comforted, and that being joined together in love, they may come to the full wealth of the certain knowledge of the secret of God, even Christ,

In whom are all the secret stores of wisdom and knowledge.

For your life on earth is done, and you have a secret life with Christ in God.

And making prayer for us, that God may give us an open door for the preaching of the word, the secret of Christ, for which I am now in chains;