What Is the Difference Between Natural Law and Positive Law?

According to the University of Louisiana at Lafayette, natural law refers to those laws that derive their legitimacy from moral reasoning and are based on what is believed to serve the best interests of the common good while positive laws are those that obtain their legitimacy through legislative means and are enforced by civil or political authority. Based on a strict interpretation of natural law, any legal statute that conflicts with natural law is unjust and should not be obeyed. According to positive legal theory, the legitimacy of a law is not relevant to its morality, but rather stems from the power of the authority that enacted it.