 The Wars of Lord competes with Light of the Lord, by  Hasdai Crescas  (c. 1340–1410/11) as the most profound and adventurous medieval Hebrew philosophical treatise. Crescas too developed a bold theory about divine prescience, completely opposed to Gersonides’s  (§3.2).  Crescas considered himself an upholder of Jewish orthodoxy in opposition to Aristotelianism and found powerful arguments to challenge many of the fundamental tenets of Aristotelian science: he argued for the existence of a vacuum, the plurality of worlds, time without bodies and common laws governing sublunar and superlunar worlds.