I have had the good fortune to be close to many successful entrepreneurs. And so I have a perspective as to what separates those who make it big from those who don't. Yes, the quality of the idea is critical, of course, as is the access to capital. And certainly being at the right place at the right time is the ultimate good fortune.
But, if I had to put my finger on the one dominant factor of entrepreneurial success stories, it is the absolute total unwillingness of the entrepreneur to say "uncle."
Jim Randel: The Soul of an Entrepreneur