Some losses are necessary to learn: learn to never lose again.
If you can't persist, you won't win.
Your first loss isn't your last loss. Your first win isn't your last win. Keep working.
When you stop trying, you start losing.
Even when you're right, you may lose. What do you do? Either accept the wrong or strive harder for victory.
When life deals you a bad hand, you don't give up. You play using through same hand and overcome the odds.
Pulling someone back doesn't mean you get ahead. You still lose, remaining behind the person.
When life lets you down, you don't give up, you try harder.
Don't accept apology for failure. Accept only result of success.