'Kept' in the Bible

and that by a revelation the truth hitherto kept secret was made known to me as I have already briefly explained it to you.

and to make plain [to everyone] the plan of the mystery [regarding the uniting of believing Jews and Gentiles into one body] which [until now] was kept hidden through the ages in [the mind of] God who created all things.

That is a great truth hitherto kept secret: I mean the truth concerning Christ and the Church.

and ask on my behalf that words may be given to me so that, outspoken and fearless, I may make known the truths (hitherto kept secret)