'Secret' in the Bible

He did this when he revealed to us the secret of his will, according to his good pleasure that he set forth in Christ,

that by revelation the divine secret was made known to me, as I wrote before briefly.

When reading this, you will be able to understand my insight into this secret of Christ.

Now this secret was not disclosed to people in former generations as it has now been revealed to his holy apostles and prophets by the Spirit,

and to enlighten everyone about God's secret plan -- a secret that has been hidden for ages in God who has created all things.

For the things they do in secret are shameful even to mention.