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20 Motivational Quotes from Legendary Entrepreneurs, Leaders and Visionaries (Infographic) Feeling like a failure? Gain some perspective with help from these famous quotes.

By Catherine Clifford

Opinions expressed by Entrepreneur contributors are their own.

Even the most grand, world-changing projects require some amount of tedious, get-it-done slogging.

If you're having one of those days where you feel like nothing will come of your efforts -- and you don't have time to watch Rocky or any of these inspiring movies -- take a spin through some of the motivational quotes included in the infographic below, generated by the website SuccessStory.com.

Related: Forget Practical Choices. To Live Your Best Life, Make Happy Choices.

Here's one of our favorites: "Our greatest weakness lies in giving up. The most certain way to succeed is to try just one more time."

Read the infographic for 19 more shots of inspirational espresso.

Related: 10 Promising Startups Poised to Change the Way You Live, Work and Play

Click to Enlarge

20 Motivational Quotes from Legendary Entrepreneurs, Leaders and Visionaries (Infographic)

Related: You Have the Power to Rewire Your Brain for More Joy

Catherine Clifford

Senior Entrepreneurship Writer at CNBC

Catherine Clifford is senior entrepreneurship writer at CNBC. She was formerly a senior writer at Entrepreneur.com, the small business reporter at CNNMoney and an assistant in the New York bureau for CNN. Clifford attended Columbia University where she earned a bachelor's degree. She lives in Brooklyn, N.Y. You can follow her on Twitter at @CatClifford.

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