EVERY MOMENT IN BUSINESS happens only once. The next Bill Gates will not build an operating system. The next Larry Page or Sergey Brin wont make a search engine. And the next Mark Zuckerberg wont create a social network. If you are copying these guys, you arent learning from them.
Peter Thiel,
Zero to One: Notes on Startups, or How to Build the Future
Zero to One by Peter Thiel