11 Seeing, therefore, that all the hopes of Italy and of the whole world lie in the power, so beneficent to the common good and profit, wherewith the authority of the apostolic see is endowed, and in the close union which binds all the faithful of Christ to the Roman Pontiff, We recognize that nothing should be nearer Our heart than how to preserve safe and sound the dignity of the Roman see, and to strengthen ever more and more the union of members with the head, of the children with their father.
Source: Inscrutabili Dei Consilio (Vatican.va)