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Second, crucial decisions, decisions which affect the entire Church, are only taken by a Council of the entire Church, not unilaterally by any one man or any one Church. These are really the basics of what could be called "traditional Christian ecclesiology 101" and the blatant violation of this key ecclesiological dogma by the Papacy in 1054 was as much a cause for the historical schism between East and West (really, between Rome and the rest of Christian world) as was the innovation of the filioque itself.
Saint Maximos the Confessor says that, while Christians are divided into categories according to age and race, nationalities, languages, places and ways of life, studies and characteristics, and are "distinct from one another and vastly different, all being born into the Church and reborn and recreated through it in the Spirit" nevertheless "it bestows equally on all the gift of one divine form and designation, to be Christ's and to bear His Name. And Saint Basil the Great, referring to the unity of the Church says characteristically: "The Church of Christ is one, even tough He is called upon from different places". These passages, and especially the life of the Church, do away with every nationalistic tendency. It is not, of course, nations and homelands that are abolished, but nationalism, which is a heresy and a great danger to the Church of Christ.
Comment: There's a world of difference between those who prophesy war and do everything they can to prevent it, and those who can't wait for the bloodshed to usher in God's kingdom. That said, it's unclear from the article where the rabbi stands, but he should read up on his history. WWI wasn't set off by the assassination of Ferdinand: James Corbett's "The WWI Conspiracy": To Start A War. And the three abducted Israeli teens were only the pretext for war in 2014, not the cause. The Israeli government knew the teens had been murdered and that Hamas's leadership wasn't responsible, but they wanted war, so they pretended the teens were still alive, launched a bogus 'rescue' mission and attacked Gaza anyway.