Looking for inspiration? There are some nice quotes by Gandhi that might help. Need to get a little shock to your system, figure out some business strategy, pull yourself out of a pit, and get busy with a new startup idea? That's where Mark Cuban can help. Here are 20 of his best quotes, hand-picked to knock your socks off.

1. "What I do know, at least what I think I have learned from my experiences in business, is that when there is a rush for everyone to do the same thing, it becomes more difficult to do. Not easier. Harder."

2. "I love to challenge conventional wisdom. I'm a big believer that in business and in politics, when everyone is doing the same thing, none are probably as effective or successful as they could be. Typically it's not prudent for people within those industries, parties, or organizations to stand up and challenge the incumbents. It is usually a formula for losing a job, customer, or endorsement. My businesses are usually built around challenging conventional wisdom, so I tend to gain by taking the other side. It's been very profitable and entertaining for me."

3. "Do the things that make perfect sense to you, [and] don't be afraid to shout it from the mountain tops just because it's outside the box or against the grain in your industry. More often than not, you're probably going to be right."

4. "A sure sign of failure for a startup is when someone sends me logo-embroidered polo shirts. If your people are at shows and in public, it's okay to buy for your own employees, but if you really think people are going to wear your branded polo when they're out and about, you are mistaken and have no idea how to spend your money."

5. "Your customers can tell you the things that are broken and how they want to be made happy. Listen to them. Make them happy. But don't rely on them to create the future road map for your product or service. That's your job."

6. "It's not whether the glass is half empty or half full, it's who is pouring the water. The key in business and success at any endeavor is doing your best to control your destiny. You can't always do it, but you have to take every opportunity you can to be as prepared as--and ahead of--the competition as you possibly can be."

7. "It doesn't matter how many times you fail. You only have to be right once and then everyone can tell you that you are an overnight success."

8. "Investors don't care about your dreams and goals. They love that you have them. They love that you are motivated by them. Investors care about how they are going to get their money back and then some. Family cares about your dreams. Investors care about money."

9. "Being rich is a good thing. Not just in the obvious sense of benefiting you and your family, but in the broader sense. Profits are not a zero sum game. The more you make, the more of a financial impact you can have."

10. "Don't start a company unless it's an obsession and something you love. If you have an exit strategy, it's not an obsession."

11. "What does it take to be a successful entrepreneur? It takes willingness to learn, to be able to focus, to absorb information, and to always realize that business is a 24/7 job where someone is always out there to kick your ass."

12. Cuban defines a successful employee as one who is "focused, hungry to learn, and willing to work hard to gain an information advantage with an understanding that the customer owns us."

13. "In your life, how do you define success? Success is being able to wake up every day with a smile on my face, looking forward to the day. Which is exactly how I described it when I was broke, sleeping on the floor."

14. "Know your core competencies and focus on being great at them. Pay up for people in your core competencies."

15. "If you won't put your money in the bank, NEVER put your money in something where you don't have an information advantage. Why invest your money in something because a broker told you to? If the broker had a clue, he/she wouldn't be a broker, they would be on a beach somewhere."

16. "One problem people have is that they lie to themselves.... Rarely is talent enough. You have to find ways to make yourself standout. You do so by playing to your strengths and making people aware of those strengths."

17. "Focus on building the best possible business. If you are great, people will notice and opportunities will appear."

18. "Creating a close connection to those you do business with has its many risks, rewards, and consequences. There are few things in business I have encountered that are more difficult than firing someone, particularly if that someone has always been, or has become a friend. On the flip side, I have been rewarded with many friends."

19. "Sweat equity is the most valuable equity there is. Know your business and industry better than anyone else in the world. Love what you do or don't do it."

20. "Learn to sell. In business you're always selling--to your prospects, investors, and employees. To be the best salesperson, put yourself in the shoes of the person to whom you're selling. Don't sell your product. Solve their problems."