Originally Posted by Sam Spade
Morality requires an appeal to a higher authority. Any person who says that he establishes his own morality is, at best, misled. You can't give birth to yourself.
What does "you can't give birth to yourself" have anything to do with anything? Without appeal to a higher authority, we can establish basic moral principles such as "murder is wrong" through simple application of the Golden Rule. The details are more complicated, and this is true whether your morals come out of a book of fables or through analysis without asking a higher power.