Sometimes, when the times get tough, we tend to doubt ourselves more than usual. It's a natural thing, but it doesn't mean it's the end. When life gives you lemons, make lemonade. Here are 10 important quotes to keep in mind any time you're feeling down, to bring your motivation right back up:

1. "Doubt yourself, and doubt everything you see. Judge yourself, and you see judges everywhere. But if you listen to the sound of your own voice, you can rise above doubt and judgment. And you can see forever." --Nancy Lopez

2. "Stop waiting for the 'perfect' time to pursue your dreams; you have just what you need to begin right now." --Carmen Sakurai

3. "When finding yourself doubting how far you can go, just remember how far you've come. Remember everything you have faced, all the battles you have won, and all of the fears you have overcome." --Unknown

4. "No one can make you feel inferior without your consent." --Eleanor Roosevelt

5. "When I get sad, I stop being sad, and get awesome instead. True story." --Neil Patrick Harris

6. "If we wait until we're ready, we'll be waiting for the rest of our lives." --Lemony Snicket

7. "You should never doubt yourself because you never, ever know what's around the corner." --Kellie Pickler

8. "Everyone is a genius. But if you judge a fish on its ability to climb a tree, it will live its whole life believing it is stupid." --Albert Einstein

9. "Don't let the noise of other people's opinions drown out your inner voice." --Steve Jobs

10. "Doubt your doubts before you doubt your beliefs." --Chace Crawford

These quotes can help you to remember that everyone doubts themselves sometimes.