Why you do what you do is as important as your output. Most of us have to work to pay the bills, but what is it, other than money, that gets you out of bed in the morning?
It might be the thrill of building a business and watching it and your employees grow and flourish. It might be dedicating your career to non-profit causes or a particular industry such as healthcare or animal welfare.
Whatever it is, being able to articulate a purpose higher than earning cash will help motivate you through hard times and give your personal brand some depth and tenacity.