This work is an investigation of the influence of academic philosophy on non-academics in the Early Modern period (the 16th and 17th centuries). The first chapter will use Craig’s Similarity Thesis to examine Early Modern philosophy in general, Philosophy of Science and Theology and how they interacted to elevate human reason to the level of divine certainty. The second chapter will draw on Dear’s description of the changing status of mathematics in academia in the Early Modern period. This second chapter will draw the importance and divine relevance of rationality as developed in the first chapter into the discussion to further explore the relationships between science, metaphysics, mathematics and the divine. The third and final chapter will examine one particular instance of the influence of these ideas on popular thought, specifically in Girard Thibault’s early 17th century treatise instructing the reader in swordsmanship, who uses the view of mathematics and the rational mind that is discussed in the preceding chapters to inform his theories of martial arts practice and pedagogy. / Thesis (M.A.)-University of KwaZulu-Natal, Durban, 2009.