In whom are hid all the treasures of wisdom and knowledge. (Col 2:3 KJV)

 in whom are hidden all the treasures of wisdom and knowledge [regarding the word and purposes of God]. (Col 2:3 AMP)

 To whom God would make known what is the riches of the glory of this mystery among the Gentiles; which is Christ in you, the hope of glory: (Col 2:3 KJV)

God [in His eternal plan] chose to make known to them how great for the Gentiles are the riches of the glory of this mystery, which is Christ in and among you, the hope and guarantee of [realizing the] glory.  (Col 1:27 AMP)