“Win or lose, do it fairly.”
As quoted in Swimming World and Junior Swimmer Vol. 20 (1979), p. 57
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Knute Rockne 6
American college football player and college football coach… 1888–1931Related quotes

“The object is to win fairly, by the rules – but to win. ”

“Sometimes it is better to lose and do the right thing than to win and do the wrong thing.”
Hansard http://www.publications.parliament.uk/pa/cm200506/cmhansrd/vo051109/debtext/51109-03.htm#51109-03_spmin10, House of Commons, 6th series, vol. 439, col. 302.
9 November 2005, responding to Charles Kennedy in the House of Commons during Prime Minister's Questions. Blair was referring to the likely defeat in Parliament of additional powers to detain terror suspects without charge, which happened later that day.
2000s
Source: How to Win Friends and Influence People
Source: Schwager, Jack D. (Editor), Market Wizards, HarperCollins (1989), page 172, ISBN 0-88730-610-1, Read it here http://books.google.com/books?id=jNG7r-Ul7jwC&printsec=frontcover&dq=market+wizards&ei=stanR4q2LKTeiQGMxbFo&sig=8NhAQMHBUZCiBzaJjF4o2ZcOGMY#PPA172,M1

“If I win - I win for all our people, if I lose - I lose only myself.”
A letter to Panayot Hitov, written in March/April 1868.
Original: (bg) Ако спечеля, печеля за цял народ – ако загубя, губя само мене си.

“One should always play fairly when one has the winning cards.”

On character building in “Wearing the Words: An Interview with Anna Deavere Smith” https://tricycle.org/magazine/wearing-words-interview-anna-deavere-smith/ in the Buddhist Review (Fall 1994)