even the mystery which hath been hid from ages and from generations, but now is made manifest to his saints:
The mystery of which was hidden for ages and generations [from angels and men], but is now revealed to His holy people (the saints),
even the mystery which hath been hid for ages and generations: but now hath it been manifested to his saints,
I’m completing it with a secret plan that has been hidden for ages and generations but which has now been revealed to his holy people.
the mystery which had remained hidden to past ages and generations, but which now is manifested to his saints.