4. NEW TESTAMENT SOURCE OF THE PETRINE OFFICE: CONTROVERSIES AND DEBATES IN VARIOUS EXPLANATIONS: CATHOLIC, ORTHODOX AND PROTESTANT - THE ECUMENICAL ASPECT OF PETRINE MYSTERY / RADICI NEOTESTAMENTARIE DELL’UFFICIO PETRINO: CONTROVERSIE E SVILUPPO DA DIVERSE SPIEGAZIONI CATTOLICHE, ORTODOSSE E PROTESTANTI.