There have been projects and ideas in my entrepreneurial career that got tricky and challenging: moments when I thought of chucking it all and moving on to the next thing. But something made me “keep on keepin’ on” with those projects until they bore fruit — or completely depleted themselves of any chance of a future profit. It turns out that this is one of the defining attributes of successful entrepreneurs. I wasn’t born that way; I had mentors who wouldn’t stop when things turned bad, and it taught me to hang in there. If you find yourself quitting too soon, make a conscious effort to go the extra mile for the next project or idea. See what happens.