Isaac, a Philosopher, and a Doctor

Isaac describes his first principle as a creator God who, unlike all other causes, can produce things by bringing them to be out of nothing. For Isaac, emanation is not just a shining of light, but a casting of shadow. Darkness increases as God's originating activity becomes more mediated by the intervening influence of mind than soul. Another reason Isaac foreshadows developments in later Jewish philosophy is that he was also a doctor.