Even the mystery which hath been hid from ages and from generations, but now is made manifest to his saints:

the mystery that was hidden for ages and generations but is now revealed to His saints.

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:

To them God has chosen to make known among the Gentiles the glorious riches of this mystery, which is Christ in you, the hope of glory.

Withal praying also for us, that God would open unto us a door of utterance, to speak the mystery of Christ, for which I am also in bonds:

as you pray also for us, that God may open to us a door for the word, so that we may proclaim the mystery of Christ, for which I am in chains.