'Hidden' in the Bible

He is revealing deep and hidden things; He hath known what is in darkness, and light with Him hath dwelt.

'And in the latter end of their kingdom, about the perfecting of the transgressors, stand up doth a king, fierce of face, and understanding hidden things;

And I have seen -- I, Daniel, by myself -- the appearance: and the men who have been with me have not seen the appearance, but a great trembling hath fallen on them, and they flee to be hidden;

And he saith, 'Go, Daniel; for hidden and sealed are the things till the time of the end;