Core principles, strategic execution, and a strong foundation are the building blocks of great businesses. Consider elements such as a distinct vision and mission, a robust value proposition, and a customer-centric approach.
Great businesses are definitely built on belief and determination. But I'd say they also need a solid plan, the right team, sufficient funding, and the ability to adapt to challenges and changes in the market. Conviction in your vision keeps you going, but you need the fundamentals in place too if you want to succeed long-term IMO.