Achieving your Definite Purpose involves spending as much time as possible doing what you love to do.
Napoleon Hill said it "is the starting point of all achievement and success. All individual achievement begins with the adoption of a definite major purpose and a specific plan for its attainment".
Of course, when you are doing what you love to do and were created to do, it doesn't feel much like work.
In my case, being totally self-employed, I work many hours and think about business a lot, sometimes too much.
The one caveat being that you must also have some innate talents, skills, and abilities to truly excel.
For instance, I would REALLY love to play hockey for the Montreal Canadiens. I would even love to coach them if the playing thing didn't work out. Unfortunately, I do not have the skill, talent, or ability to either play in the NHL or coach.
At the same time, in the case above, if the passion for hockey was very strong, then you could get a good job that would allow you the time and money to spend your non-working hours volunteering in a local arena in some fashion.
I love what Steve Jobs said about a Definite Purpose: "The only way to do great work is to love what you do. If you haven't found it yet, keep looking. Don't settle. As with all maters of the heart, you'll know when you find it."
Above: 3D artwork of Michael Telapary of Napoleon Hill Success Principle of Definiteness Purpose hanging in my home office.
Micheal's artwork of the 17 Success Principles is the official art work of the Napoleon Hill Foundation. Michael and Judy Williamson, Director of the Napoleon Hill World Learning Center at Purdue University Calumet, worked together to create these beautiful and thought provoking images.
I own all 17 and they hang in my home office. I absolutely love looking at them.