“Doing what needs to be done may not make you happy, but it will make you great.”
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George Bernard Shaw 413
Irish playwright 1856–1950Related quotes

“You can never get enough of what you don't need to make you happy.”
Variant: You can never get enough of what you don’t really need.

“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

“Whatever you decide to do, make sure it makes you happy.”
Source: Unsourced

you ask. "Well, I'll get more," he says. Just as at cricket, you get more runs. There's no use in the runs, but to get more of them than other people is the game. So all that great foul city of London there, — rattling, growling, smoking, stinking, — a ghastly heap of fermenting brickwork, pouring out poison at every pore, — you fancy it is a city of work? Not a street of it! It is a great city of play; very nasty play and very hard play, but still play.
The Crown of Wild Olive, lecture I: Work, sections 23-24 (1866)

Speech http://www.politico.com/blogs/2016-dem-primary-live-updates-and-results/2016/02/hillary-clinton-donald-trump-slogan-219908 (February 2016)
Presidential campaign (April 12, 2015 – 2016)
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