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The process of disintegration described earlier with regard to the rites of initiation is apparent here, again, with regard to the theology of initiation and membership. In Augustine, membership was located within the threefold unity of faith, Baptism, and “Catholic peace” or Church unity. In Suárez, who refers back to Augustine but misunderstands him, it was faith, righteousness, and baptismal character. In Benedict XIV, who refers back to Suárez, it is now only baptismal character, which—it is important to stress—depends only upon “the proper form and matter” (validity). The initial, more restrained sacramental minimalism of Augustine has undergone such a “development of doctrine” as would be unrecognizable to Augustine himself.
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Peter Heers (The Ecclesiological Renovation of Vatican II: An Orthodox Examination of Rome's Ecumenical Theology Regarding Baptism and the Church)