So far, about morals, I know only that what is moral is what you feel good after and what is immoral is what you feel bad after.
-Ernest Hemingway

Do not be too moral. You may cheat yourself out of much of life. So aim above morality. Be not simply good; be good for something.
-Henry David Thoreau

If moral behavior were simply following rules, we could program a computer to be moral.
-Samuel P. Ginder, US navy captain

Morality, like art, means drawing a line someplace.
-Oscar Wilde

We have in fact, two kinds of morality, side by side: one which we preach, but do not practice, and another which we practice, but seldom preach.
-Bertrand Russell