Moral Objectivism holds that there are universal moral principles that are valid for all people and situations. It can be explained through either Divine Law and human sin or through Natural Law, which argues morality is a function of human nature and moral principles can be found by examining humanity and society. Natural Law first appeared with Stoics, who believed humans have a divine spark and are governed by rational laws of the universe, though they have free will. Thomas Aquinas combined this with Aristotle's view that humans have a specific purpose and function discoverable through reason. There are also principles of core morality and humanity that are argued to be universal.