Quotes:
“Moral codes adjust themselves to conditions”
Morals are the rules by which a society exhorts (as laws are the rules by which it seeks to compel) its members and associations to behavior consistent with its order, security, and growth. A little knowledge of history stresses the variability of moral codes, and concludes that they are negligible because they differ in time and place, and sometimes contradict each other. A larger knowledge stresses the universality of moral codes, and concludes to their necessity. Moral codes differ because they adjust themselves to historical and environmental conditions.
Will Durant, 1968 from the book The Lessons of History