Enthusiasm may get you started. But it won't create you a business with longevity.

What else can we use, besides enthusiasm... to sustain our lives?

0.13 - Best Intentions & Enthusiasm
1.40 Logical, Binary Process
2.37 Mr Enthusiastic
3.46 Enthusiasm is  for Children. What else to rely on?
5.06 Long-Term Thinking
5.57 Working to the Larger Aim
7.00 Amateurs Rely on Enthusiasm
9.50 New Things Always Fun
10.40 Success is Not Enthusiastic Sales, but Longevity
11.50 Comparing Enthusiasm vs Conviction
11.20 Professionals Commit
14.00 Long-term Planning & Failure