God is often conceived as the Supreme Being and principal object of faith. In theism, God is the creator and sustainer of the universe. In deism, God is the creator (but not the sustainer) of the universe. In pantheism, God is the universe itself. Theologians have ascribed a variety of attributes to the many different conceptions of God. Common among these are omniscience (infinite knowledge), omnipotence (unlimited power), omnipresence (present everywhere), and omnibenevolence (perfect goodness). Monotheism is the belief in the existence of one God or in the oneness of God. Many notable medieval philosophers and modern philosophers have developed arguments for and against the existence of God. There are many names for God, and different names are attached to different cultural ideas about who God is and what attributes he possesses.