45 Well known are the terms of Vatican Council's solemn definition: "Relying on the open testimony of the Scriptures and abiding by the wise and clear decrees both of our predecessors, the Roman Pontiffs, and the general Councils, We renew the definition of the Ecumenical Council of Florence, by virtue of which all the faithful must believe that 'the Holy Apostolic See and the Roman Pontiff hold primacy over the whole world, and the Roman Pontiff himself is the Successor of the blessed Peter and continues to be the true Vicar of Christ and head of the whole Church, the father and teacher of all Christians, and to him is the blessed Peter our Lord Jesus Christ committed the full power of caring for, ruling and governing the Universal Church....'
Source: Ad Apostolorum Principis (Vatican.va)