"The Myths by Which We Live", in The Rotarian, Vol. 107, No. 3 (September 1965), p. 55
Variant: The purpose of life is not to be happy at all. It is to be useful, to be honorable. It is to be compassionate. It is to matter, to have it make some difference that you lived.
“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.”
Attributed to Emerson in Life’s Instructions for Wisdom, Success, and Happiness (2000) by H. Jackson Brown Jr., as well as numerous on-line sources since, the article "The Purpose of Life Is Not To Be Happy But To Matter" at the Quote Investigator https://quoteinvestigator.com/2014/11/29/purpose/ indicates that this quote is probably derived from various statements first made by Leo Rosten, including the following words delivered at the National Book Awards held in New York in 1962: "The purpose of life is not to be happy — but to matter, to be productive, to be useful, to have it make some difference that you lived at all."
Misattributed
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Ralph Waldo Emerson 727
American philosopher, essayist, and poet 1803–1882Related quotes

Source: The End of Starvation : Creating an Idea Whose Time Has Come, Werner Erhard, 1977, 3 http://www.wernererhard.net/thpsource.html,
Source: Also published in — The end of starvation: creating an idea whose time has come, 3, 1982, Werner Erhard http://books.google.com/books?id=4o4wAAAAMAAJ&q=%22be+of+genuine+consequence+in+the+world%22&dq=%22be+of+genuine+consequence+in+the+world%22&hl=en&sa=X&ei=rpyFUvTMB6_MsQT0sYCwDQ&ved=0CDQQ6AEwAQ,
Source: Also quoted in — [The Answer : What do you mean I have to figure it out for myself?, 2001, Quila H. Creig] and — [The Spartan Life 2, Scott Westerman, 2012]

“Count it the greatest sin to prefer life to honor, and for the sake of living to lose what makes life worth living.”
Summum crede nefas animam praeferre pudori
et propter vitam vivendi perdere causas.
VIII, line 83.
Satires, Satire VIII

“Happiness is not a goal… it's a by-product of a life well lived.”
Variant: Happiness is not a goal, it is a by-product.
Source: You Learn by Living (1960), p. 95
Context: Happiness is not a goal, it is a by-product. Paradoxically, the one sure way not to be happy is deliberately to map out a way of life in which one would please oneself completely and exclusively.