Often we consider an opportunity based on how easy it is. The problem with this analysis is that if it's easy, it's often not worth doing. It's easy to start a blog, but of course, starting a blog doesn't really deliver a lot of value. Posting 4,100 blog posts in a row, though, isn't easy. It's do-able, clearly do-able, and might just be worth it.
Successful organizations seek out the do-able. When Amazon went after the big bookstore chains, analysts ridiculed them for doing something insanely difficult. But it was clearly do-able. Persistence and talent and a bit of luck, sure, but do-able.
Sometimes we seek out things that are actually impossible. Building a search engine that's just like Google but better is impossible (if your goal is to dominate the market with it). It's fun to do impossible projects because then you don't have to worry about what happens if you succeed… you have a safety net, because you're dreaming the impossible dream.
Do-able, though, is within our reach. Ignore easy.