0 To the Patriarchs, Primates, Archbishops, and Bishops of the CatholicWorld in Grace and Communion with the Apostolic See. The hidden design of the divine wisdom, which Jesus Christ the Saviour of men came to carry out on earth, had this end in view, that, by Himself and in Himself, He should divinely renew the world, which was sinking, as it were, with length of years into decline. The Apostle Paul summed this up in words of dignity and majesty when he wrote to the Ephesians, thus: "That He might make known unto us the mystery of His will... to re-establish all things in Christ that are in heaven and on earth."(1)
Source: Arcanum Divinae (Vatican.va)