No single person had as great an impact on Jewish thought as did Moses Maimonides (1138-1204). In addition to his tremendous accomplishments in the fields of philosophy and law, Maimonides was thoroughly versed in the sciences of his day, and the sciences were fully integrated into his view of Judaism; indeed, Maimonides' outlook was guided in large part by the scientific opinion of his day. His philosophy asserts the unity of all truth, that the deity, in keeping with Arabic usage, is in fact The Truth (al-haqq), and that the religious imperative to know God is essentially the same as the philosophical imperative to determine the truth. Many statements issuing from the different branches of knowledge claim to be true. However, Maimonides affirms, the strongest and securest claims to truth are made by the sciences, most especially the mathematical sciences, whose statements are demonstrated with logical rigor. Moreover, of all the components of the cosmos, it is the heavenly bodies, with their regular motion and subtle physics, that disclose something approaching the nature of the divine. Furthermore, the human body is marvelously constructed, and its study is also useful for the religious quest. The science of medicine, which conducts this investigation, is also important as a guide for the conduct of a healthy life – a life as free as possible from the physical and emotional disturbances that interfere with the religious quest.