"Most people fail in life not because they aim too high and miss but because they aim too low and hit."
Is your big entrepreneurial idea really big enough? Would the rest of the world agree that it is a big idea or is that just your perspective?
When in doubt, dream bigger. The ideas that catch fire in the world of business are the ones who have lots of impact. They can impact many. Or they have a huge impact on a smaller number of people.
I don't know about you but that Les Brown quote above scares the crap out of me in a good way. It is making me challenge my beliefs that some of my ideas are big ideas and that is healthy.
When in doubt, aim higher.