Greatness is found in the pursuit of your heart's desires.
When you deeply desire success in an area of your life your inner guidance will drive you to achieve it. You will commit regardless of the percieved obstructions that litter your path.
You will find joy in your toil and pride in your sweat as your heart will be glad to suffer and bleed to reach for your dreams. The journey, whether ultimately succesful or not, will be satisfying and rewarding to you because you will be living your passion.
So, follow your heart to find fulfilment in your life. Then maybe you will find that instead of working to live, life will work for you.