“It isn't what you have or who you are or where you are or what you are doing that makes you happy or unhappy. It is what you think about it.”
Variant: It isn't what you have, or who you are, or where you are, or what you are doing that makes you happy or unhappy. It is what you think about.
Source: How to Win Friends and Influence People
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Dale Carnegie 98
American writer and lecturer 1888–1955Related quotes

“You make do with what you have. As you age you learn even to be happy with what you have.”
Source: What I Talk About When I Talk About Running

“Happiness isn't wanting what you can get, but wanting what you have.”
Source: The Judgment

“Happiness is when what you think, what you say, and what you do are in harmony.”
As quoted in Plenty of Time to Sleep When You're Dead : A Compilation of Life-changing Quotes (2006) by Richard Caridi
As quoted in Sprituality in a Materialistic World (2008) by Leslie Klein
Variant: Remember happiness doesn't depend on who you are or what you have; it depends solely upon what you think.

On his childhood roots in Tamil Nadu.
Appreciate science for what it is: Venkatraman Ramakrishnan

“Do what you can, with what you have, where you are.”
Ch. IX : Outdoors and Indoors, p. 336; the final statement "quoted by Squire Bill Widener" as well as variants of it, are often misattributed to Roosevelt himself.
Variant: Do what you can, with what you have, where you are.
Attributed to Roosevelt in Conquering an Enemy Called Average (1996) by John L. Mason, Nugget # 8 : The Only Place to Start is Where You Are. <!-- The Military Quotation Book, Revised and Expanded: More than 1,200 of the Best Quotations About War, Leadership, Courage, Victory, and Defeat (2002) by James Charlton -->
Variant: Do what you can, with what you've got, where you are.
Context: There are many kinds of success in life worth having. It is exceedingly interesting and attractive to be a successful business man, or railroad man, or farmer, or a successful lawyer or doctor; or a writer, or a President, or a ranchman, or the colonel of a fighting regiment, or to kill grizzly bears and lions. But for unflagging interest and enjoyment, a household of children, if things go reasonably well, certainly makes all other forms of success and achievement lose their importance by comparison. It may be true that he travels farthest who travels alone; but the goal thus reached is not worth reaching. And as for a life deliberately devoted to pleasure as an end — why, the greatest happiness is the happiness that comes as a by-product of striving to do what must be done, even though sorrow is met in the doing. There is a bit of homely philosophy, quoted by Squire Bill Widener, of Widener's Valley, Virginia, which sums up one's duty in life: "Do what you can, with what you've got, where you are."