1 Enoch 46:2
1 And there I saw One who had a head of days, and His hair was white like wool. With Him was another being whose countenance resembled that of a man, and his face was full of graciousness, like one of the holy angels. 2 And I asked the angel who accompanied me and showed me all the hidden things, about that Son of Man, who he was, where he was from, and why he accompanied the Head of Days? The angel answered and said to me: 'This is the Son of Man who possesses righteousness, with whom righteousness dwells, and who reveals all the hidden treasures, because the Lord of Spirits has chosen him, and his status is foremost before the Lord of Spirits in uprightness forever.' 3 'And this Son of Man whom you have seen will raise up the kings and the mighty from their seats, and the strong from their thrones, will loosen the reins of the strong, and break the teeth of the sinners.' 4 'And he shall depose the kings from their thrones and kingdoms because they do not praise and honor Him, nor humbly acknowledge where the kingdom was bestowed upon them.'
Colossians 2:3
1 For I want you to know how great a struggle I have for you, and for those in Laodicea, and for those who have not met me face to face. 2 My goal is that their hearts, having been knit together in love, may be encouraged, and that they may have all the riches that assurance brings in their understanding of the knowledge of the mystery of God, namely, Christ, 3 in whom are hidden all the treasures of wisdom and knowledge. 4 I say this so that no one will deceive you through arguments that sound reasonable. 5 For though I am absent from you in body, I am present with you in spirit, rejoicing to see your morale and the firmness of your faith in Christ.
Notes and References
"... Central to apocalyptic thought was the view that certain events, especially those connected with the kingdom of God and the Messiah, had been hidden in God's eternal purposes but were now revealed to the seer (compare, for example, 1 Enoch 46:3), and of course such an idea was susceptible to development along lines in which it became associated with esoteric knowledge available only to an elite. But for Paul, as for Jewish apocalyptic, 'hiddenness' was a historical and not a mystical concept. That which was hidden was not yet revealed. Because he knew that God's plan of salvation had been fulfilled in Christ Paul could see that the mystery hidden for ages had been revealed (Colossians 1:26, 27) but that it also unfolds in two stages so that part remains hidden, awaiting revelation at Christ's final coming (3:4). This concept overlaps with another apocalyptic motif we have frequently encountered, that of future salvation being present in heaven until its revelation ..."
Lincoln, Andrew T. Paradise Now and Not yet: Studies in the Role of the Heavenly Dimension in Paul’s Thought with Special Reference to His Eschatology (p. 129) Cambridge University Press, 1981