The article deals with the question of the eternity of the world in the context of the so-called theory of double truth and of Tempier’s document of censure of 1277. The author attempts to show that, although Siger of Brabant and his colleague Boëthius of Dacia defended the view that the eternity of the world was the only correct philosophical standpoint, their position did not lead to the theory of double truth. The author is convinced that both the philosophers held that, where philosophy and theology find themselves in conflict, truth is on the side of faith. The distinction of reason from faith, however, ultimately led to the depreciation of philosophical enquiry and their conception of faith resulted in mere fideism.
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