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Ad_Gentes
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While there are many doctrinal differences between Roman Catholicism and Eastern Orthodoxy (Filioque, Purgatory, Immaculate Conception, among others), I’ve found that the main difference and obstacle to reunification between our Churches is the role and view of the papacy. In fact, many of the doctrinal differences discussed in previous posts are somewhat linked to the authority and infallibility of the Pope. For example, I’ve seen different views among Orthodox Christians with regards to the Immaculate Conception. Some could actually accept this if defined by an Ecumenical Council of both East and West. But it was a Roman Pope who defined this Catholic dogma and that makes it unacceptable to Eastern Orthodox. The same goes for the Filioque; the explanation of the procession of the Holy Spirit as proceeding from the Father through the Son could be acceptable to some Orthodox Christians. However, the Councils were clear that no changes would be made to the Nicene Creed. From the Orthodox perspective, only a “real” Ecumenical Council could revisit the Creed and rule on the Filoque. Other apparent doctrinal differences could potentially be reconciled. I don’t believe Papal Supremacy and Infallibility falls under this category. While Eastern Orthodox would accept a primacy of honor for the Bishop of Rome, and even some (maybe a minority) a degree of authority in administrative matters, I see it difficult for the Orthodox Churches as a whole to accept that the Roman Pontiff has supreme and immediate jurisdiction over all the Churches and that he enjoys infallibility when speaking Ex Cathedra.