The document discusses the importance of defining an organization's core purpose. It explains that a core purpose reflects an organization's passion and reason for existing, capturing its soul. It should help guide decisions and inspire employees. Examples are given of core purposes for 3M ("To solve problems innovatively") and Facebook ("To make the world more open and connected"). Readers are encouraged to work with their teams to define their own core purpose and bring it to life in various ways, such as using it for recruiting, training, and strategic planning.