… is from page 51 of the 1972 second edition of Henry Hazlitt’s superb – yet, sadly, largely overlooked – 1964 book, The Foundations of Morality:
Moralities are systems of principles whose acceptance by everyone as overruling the apparent dictates of immediate self-interest is in the long-run interest of everyone alike. We should be moral because being moral is following rules which disregard apparent self-interest in the short run and are designed to promote our own real long-run interest as well as the interest of others who are affected by our actions.


Moralities are systems of principles whose acceptance by everyone as overruling the apparent dictates of immediate self-interest is in the long-run interest of everyone alike. We should be moral because being moral is following rules which disregard apparent self-interest in the short run and are designed to promote our own real long-run interest as well as the interest of others who are affected by our actions.
