This study of Sayf al-Din al-Amidi's (d. 631/1233) teachings on creation offers close analysis of all of his extant works of falsafa and kalam. Some of these were not known to previous scholars, yet they bear witness to key facets of the interaction between the historically inimical traditions of Hellenic philosophy and rational theology at this important intellectual moment. Al-Amidi is seen to grapple with the encounter of two paradigms for the discussion of creation. On the one hand, Ibn Sina's metaphysical concept of necessity of existence is the basis of his doctrine of the world's pre-eternal emanation. On the other, for the mutakallimun, the physical theory of atomism bolsters the view that God created the world from nothing. This study is of interest to scholars of Ibn Sina and Ash'arism alike, as it advances our understanding of the ongoing tradition of rational theology in the Islamic world, long past Abu Hamid al-Ghazali's (d. 505/1111) famous attack on the philosophers.