This study examines the notion of antinomy, or unavoidable contradiction, in the work of Pavel Florensky. Many Russian philosophers of the Silver Age shared a common conviction which is yet to receive sufficient attention in critical literature, either in Russia or abroad. This is namely a philosophical and theological dependence on unavoidable contradiction, paradox, or antinomy. The history of antinomy and its Russian reception is introduced here before a new framework for understanding Russian antinomism is defended. This is namely the (...) anticipation of ‘vertical’ antinomies in ‘horizontal’ antinomies. Here, by ‘horizontal’ we suppose an unavoidable contradiction of reason or philosophical reflection, and by ‘vertical’ an unavoidable contradiction of revelation, faith, or a self-contradictory dogma. The study aims to demonstrate that Florensky fails to provide a satisfactory anticipation of vertical antinomies. (shrink)