'Mystery' in the Bible

“But notice, the prosperity of the wicked is not in their hand (in their power);The counsel of the wicked [and the mystery of God’s dealings with the ungodly] is far from my comprehension.

My frame was not hidden from You,When I was being formed in secret,And intricately and skillfully formed [as if embroidered with many colors] in the depths of the earth.

The king answered Daniel and said, “Most certainly your God is the God of gods and the Lord of kings and a revealer of mysteries, since you have been able to reveal this mystery!”

‘O Belteshazzar, chief of the magicians, because I know that a spirit of the holy gods is in you and no mystery baffles or troubles you, tell me the visions of my dream which I have seen, along with its interpretation.