Because there is the fullness of the faith in the Catholic Church:***
****** LETTER TO THE BISHOPS OF THE CATHOLIC CHURCH***
ON SOME ASPECTS OF THE CHURCH UNDERSTOOD AS COMMUNION
CONGREGATION FOR THE DOCTRINE OF THE FAITH
The Primacy of the Bishop of Rome and the episcopal College are proper elements of the universal Church that are
“not derived from the particularity of the Churches”(57), but are nevertheless
interior to each particular Church. Consequently
"we must see the ministry of the Successor of Peter, not only as a ‘global’ service, reaching each particular Church from ‘outside’, as it were, but as belonging already to the essence of each particular Church from ‘within’"(58). Indeed, the ministry of the Primacy involves, in essence, a truly episcopal power, which is not only supreme, full and universal, but also
immediate, over everybody, whether Pastors or other faithful(59). The ministry of the Successor of Peter as something
interior to each particular Church is a necessary expression of that fundamental
mutual interiority between universal Church and particular Church(60).
(57) JOHN PAUL II,
Address to the Roman Curia, 20-XII-1990, n. 9: as quoted, p. 5.
(58) JOHN PAUL II,
Address to the Bishops of the United States of America, 16-IX-1987, n. 4: as quoted, p. 556.
(59) Cf. Const.
Pastor aeternus, chap. 3: Denz.-Sch`n 3064; Const.
Lumen gentium, n. 22/b.
(60) Cf.
supra, n. 9.
vatican.va/roman_curia/congregations/cfaith/documents/rc_con_cfaith_doc_28051992_communionis-notio_en.html