Master the trait that separates the millionaires from the middle class. The more time Lewis Schiff spent speaking about the seven behaviors of highly successful entrepreneurs from his book Business Brilliant , the more he became struck with a startling revelation. It occurred to him one of the seven best practices was far more important that the rest. “It is the one habit I find over and over again that is present in every single successful self-made millionaire I study,” Schiff said at the Propelify Innovation Festival in Hoboken, N.J. It’s a habit that any one of us can do, and it's completely available and accessible to everyone. Adopting this habit can help us make defining decisions about our careers. When applied with rigor, it can make the difference between achieving a high net worth and struggling to keep up with the middle class. And it’s the same trait Warren Buffett and Bill Gates both named when asked to write down a single word they would credi...