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Based on historical research gathered in this and the preceding issue in 2013 (101/4), the last article in this dossier endeavours to outline a theology of Christian origins. This sketch supposes that the concept of apostolicity, as connected traditionally to the positive “ ius divinum”, could be freed from its neoscolastic strait-jacket and thought through again in an ecumenical perspective. This could be carried out through an active confrontation between, on the one hand, what history and critical exegesis tell us of the internal normativity of the emerging Church and, on the other, what the different Christian Churches and the Catholic church expect from their relationship to their origins. The hypothesis consists in interpreting the essential markers of apostolicity that could enter into a “differentiated consensus”, not as of “divine right”, but, thanks to the grammatical paradigm of “generative grammar”. In that case, we must show that the “irreversibility”, a decisive characteristic of Christian revelation can be honoured in such a grammatical interpretation of apostolicity, better adjusted to the manifold developments of post-apostolistic Christiany than its immediately legal definition.