When asked what he considered important characteristics to be a successful entrepreneur, Scot Wingo of ChannelAdvisor, Get Spiffy and Tweener Fund, offers a one word answer: “grit”. It takes him some time to figure out if they have this trait. Entrepreneurship is hard, especially determining product market fit. You must be foolishly optimistic and stubborn, like Don Quixote, willing to run through a wall. Finally on the 90th time - you punch through. You are so passionate and crazed about what you want to do, you can make it through the hard times.