The only way to truly discover if there is gold at the end of the rainbow is to take an action and see what happens

 You won’t know until you actually try. 

You can do all the market research you want, ask everyone what they think about your idea, or speculate endlessly.

But the only way to truly discover if there is gold at the end of the rainbow is to take an action and see what happens. Until you act, you won’t know. However, none of that matters until—and unless—you answer the fourth question: do I want to do it? There is simply no way you are going to give the venture your full effort if your heart isn’t in it at least to some degree.

Nothing happens until you take that first smart step. All the ideas in the world don’t mean a thing unless you do something with them. If you don’t act, all you have is a bunch of ideas. But before you act . . . you need to know what you want.If you don’t eventually develop a strong desire, odds are you will never see your idea through. You don’t need to be obsessed or even in love with the idea, but there must be some reason pushing you forward. Otherwise, nothing will happen.

Just Start: Take Action, Embrace Uncertainty, Create the Future by Leonard A. Schlesinger, Charles F. Kiefer