You know that "Is your glass half full or half empty ?" shows you positive people.
Yet, you never ask "Is this person's glass half full or half empty ?" ... it shows you entrepreneurs.
Finding a person's glass half empty is an opportunity to fill it and win a friend.
Entrepreneurship is the ability to find and fill glasses.
You don't have to be self-employed to be an entrepreneur, you are one when you spot empty glasses and do whatever it takes to fill it... And it can be during your own paycheck full time job.
You are not entrepreneur if you are waiting someone else to see and fill it for you.