The document discusses the importance of using personas to think like humans when designing products and services. It argues that personas go beyond just being used by designers - they should be used throughout businesses. Personas are built from real user research through methods like field studies and interviews to understand users' goals, pains, behaviors and motivations. They help minimize risk by ensuring the problem is understood correctly. Personas also help establish empathy for users and create a shared understanding across organizations. The overall message is that personas are a tool to combat egocentric thinking and help product teams think more like the humans who will use their creations.