'Hidden' in the Bible

As for the mystery of the seven stars which you saw in My right hand, and the seven golden lampstands: the seven stars are the angels (divine messengers) of the seven churches, and the seven lampstands are the seven churches.

He that hath an ear, let him hear what the Spirit saith unto the churches; To him that overcometh will I give to eat of the hidden manna, and will give him a white stone, and in the stone a new name written, which no man knoweth saving he that receiveth it.

and they say to the mountains and to the rocks, Fall on us, and have us hidden from the face of him that sits upon the throne, and from the wrath of the Lamb;

but in the days of the sound of the seventh angel, when he will blow his trumpet, then God’s hidden plan will be completed, as He announced to His servants the prophets.”