What does an Entrepreneur need?

I have been in business for 50 years. 90% of them as an entrepreneur.

To stay in the game that long I believe an entrepreneur needs a lot of qualities. Here's four that I consider the most essential:

1. Belief. You have to believe deep down in your heart of hearts that you've got what it takes to make your idea successful.

2. A strong work ethic. You can't believe that someone is just going to hand you something. You have to outwork everyone.

3. Humility. You have to be willing to surround yourself with people smarter than you.

4. Resilience. Without resilience you're doomed.

Which essentials would you add?