If you want to become a millionaire — or, dream big, a billionaire — start thinking like one. And what better way to get a glimpse inside successful people's heads that to study the wisdom they've already imparted? For a dose of inspiration, CNBC Make It rounded up nine quotes from self-made billionaires that will change the way you think about money, success and innovation.

Bill Gates, co-founder of Microsoft

On why becoming a billionaire is overrated: "I can understand wanting to have millions of dollars, there's a certain freedom, meaningful freedom that comes with that. But once you get much beyond that, I have to tell you, it's the same hamburger."

Phil Knight, founder of Nike and author of "Shoe Dog"

On competition: "I thought back on my running career at Oregon. I'd competed with, and against, men far better, faster, more physically gifted. Many were future Olympians. And yet I'd trained myself to forget this unhappy fact. People reflexively assume that competition is always a good thing, that it always brings out the best in people, but that's only true of people who can forget the competition. The art of competing, I'd learned from track, was the art of forgetting, and I now reminded myself of that fact. You must forget your limits. You must forget your doubts, your pain, your past."

Mark Zuckerberg, founder and CEO of Facebook

On Facebook's goals: "We don't build services to make money; we make money to build better services."

Ray Dalio, founder of Bridgewater Associates

On building a business: "When I look back on whatever my past has been and the successes, my greatest rewards have been the people and the relationships that I've had. The money has been an accident. I mean, it's a good accident, but I happened to be playing a game that I love."

Warren Buffett, investor and founder of Berkshire Hathaway

On investing for the long-term: "Put together a portfolio of companies whose aggregate earnings march upward over the years, and so also will the portfolio's market value. If you aren't willing to own a stock for 10 years, don't even think about owning it for 10 minutes."

Elon Musk, CEO of Tesla and Space-X

On failure: "Failure is an option here. If things are not failing, you are not innovating enough."

Richard Branson, founder of the Virgin Group

On his motivation: "What I love doing is creating things I can be proud of, and if you create things that you can be proud of, the byproduct of that can be that you become a millionaire or you become a billionaire, because people like what you've created."

Jeff Bezos, founder and CEO of Amazon

On building a business with a small budget: "I think frugality drives innovation, just like other constraints do. One of the only ways to get out of a tight box is to invent your way out."

Mark Cuban, entrepreneur and shark on ABC's "Shark Tank"