Self-made millionaire Steve Siebold spent 26 years interviewing some of the wealthiest people in the world before boiling down his findings in the book "How Rich People Think." He found that there are countless ways the rich view the world differently - they have different beliefs, philosophies and strategies.

Perhaps the most striking difference is that rich people believe money is earned through thinking, while the average person believes money is earned through time and labor.

Most people "believe the only way to earn more money is to work more hours," Siebold writes. Meanwhile, "the rich know that creative thinking is the highest paid skill in the world."

High earners believe money flows from ideas and finding solutions to universal problems, he says: "The bigger the solution, the bigger the paycheck. … Making money may not be easy, but it is simple."