Today flying machines take flight because we understand the principles of laminar flow and airfoils. We use data driven design to dictate the outcome of success. Being passionately connected to an idea may disconnect us from being successful.
Nail It Then Scale It on Page 44 Says:
"Many entrepreneurs and investors operate on beliefs and gut feelings. But as research has shown, gut feelings and beliefs can be highly inaccurate. Drawing on the metaphor of the scientific method that we have employed as a motivation and description of the NISI process, entrepreneurs can develop a more scientific mind-set or data data-driven approach to launching a company." Read the Startup Book.