"The purpose of life is not to be happy. It is to be useful, to be honorable, to be compassionate, to have it make some difference that you have lived and lived well"
― Ralph Waldo Emerson
Aubry Marcus cites the above quote in his book, Own the Day, Own your Life, adding:
"Emerson is right, though I think the piece of that equation he failed to mention is that if you do all those things—be useful, honorable, compassionate— happiness tends to be the result."