'Mystery of God' in the Bible

"Can you fathom the mystery of God? Or can you probe the limits of Shaddai?

When I came to you, brothers, I did not come with superiority of speech or wisdom, proclaiming to you the mystery of God.

that their hearts may be comforted, they being knit together in love, and gaining all riches of the full assurance of understanding, that they may know the mystery of God, namely, Christ,

Without controversy, the mystery of godliness is great: He was revealed in the flesh, justified by the Spirit, seen by angels, preached among the nations, believed on in the world, and received up in glory.

but in the days of the voice of the seventh angel, when he is about to sound, then the mystery of God is finished, as he declared to his servants, the prophets.