The Logical Deduction of Doctrine

Heythrop Journal 54 (2):203-213 (2013)
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The idea that Roman Catholic doctrines for which there is no early testimony can be explained as logical deductions from undoubtedly early teachings is usually dismissed as obviously false. By invoking the logical properties of doctrines expressed as explicit generalizations, however, and by distinguishing deductions in which all the assumptions represent Apostolic doctrine from those in which all the doctrinal assumptions are Apostolic, a way is found to deduce the disputed doctrines while leaving the immutability of doctrine intact. Although a theory of theological development is thus not needed to justify doctrinal additions, developments in theology nevertheless often motivate the authoritative pronouncements cited by doctrinal deductions. Finally, it is argued that a correct understanding of such deductions improves the prospects for reunion between those whose doctrinal axioms coincide even if differing historical information has rendered them incapable of following the same chain of deductions



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