When you’re thinking about starting a company or first in the entrepreneurial trenches, any nugget of advice you can get from someone who’s been there before is like gold. But as time goes on, you’ll realize that some of those tips are better—and more applicable to your business—than others. Some founders learn on the fly. Others study at business school. Then there are those who receive a piece of advice at some point in their career that ultimately shapes everything they do.