'Secret' in the Bible

until they were filled (permeated, saturated) with every kind of unrighteousness, wickedness, greed, evil; full of envy, murder, strife, deceit, malice and mean-spiritedness. They are gossips [spreading rumors],

They were secret backbiters, open slanderers; hateful to God, insolent, haughty, boastful; inventors of new forms of sin, disobedient to parents, destitute of common sense,

on the day when God judges what people have kept secret, according to my gospel through Christ Jesus.

But he is a Jew who is a secret one, whose circumcision is of the heart, in the spirit and not in the letter; whose praise is not from men, but from God.

For I want to let you know about this secret, brothers, so that you will not claim to be wiser than you are: Stubbornness has come to part of Israel until the full number of the gentiles comes to faith.

Now to him that is of power to stablish you according to my gospel, and the preaching of Jesus Christ, according to the revelation of the mystery, which was kept secret since the world began,