By Fr. Jerry Pokorsky, Catholic Culture - Natural law includes precepts of Godly morality that coincide with man’s nature and lead us to heaven. The first tier of natural law is straightforward: “Do good, avoid evil.” The second tier includes the Ten Commandments... The third tier identifies more difficult teachings that often require Church guidance for clarity... Historically, in Western Civilization the authority of the Decalogue was culturally unassailable because God is the Author. Disobedience had distinct religious connotations.