Law is based on reason and promulgated by a competent authority for the common good. There are different kinds of moral law including eternal law, natural law, revealed law in the Old and New Testaments, and human law. Eternal law is God's plan for governing the universe according to wisdom and love. Natural law is discerned through human reason and includes precepts like doing good and avoiding evil. Revealed law comes from God through scripture and perfects the Old Law through Jesus' teachings in the New Testament. Human law regulates society but must conform with higher divine and natural laws for the common good.