“You win some, you lose some. And when you lose, you have to pull yourself together and go back for more. Otherwise, the other side wins by default.”

Referring here to the controversial US presidential election of 2000
Quotes, DNC Address (2004)
Context: I'm going to be candid with you. I had hoped to be back here this week under different circumstances, running for re-election. But you know the old saying: you win some, you lose some. And then there's that little-known third category.
But I didn't come here tonight to talk about the past. After all, I don't want you to think that I lie awake at night counting and recounting sheep. I prefer to focus on the future, because I know from my own experience that America's a land of opportunity, where every little boy and girl has a chance to grow up and win the popular vote.

Source: The Passion (1987), p.73

“When you lose, say little. When you win, say less.”, WeHeartMMA.com, 2012-09-07 http://weheartmma.com/post/2913241877/matt-hughes-when-you-lose-say-little-when-you-win-say-le,

Source: The Throne of Fire

"La vida es una partida de ajedrez y nunca sabe uno a ciencia cierta cuándo está ganando o perdiendo."
Una muñeca rusa, 1991.