The document discusses how the human brain works to make sense of the large amount of information it receives. It does this by engaging in three specific activities: deleting unnecessary information, distorting or exaggerating information, and generalizing from specific experiences. When focusing on goals and opportunities, the brain will delete problems and find solutions. However, focusing on problems can lead the brain to distort the truth and find issues where they may not exist. Generalizing takes specific events and draws broad conclusions, which can be helpful for learning but also cause people to believe single events define a lifetime of experiences. Maintaining a positive focus, minding exaggerating language, and avoiding making assumptions can help support the brain in sales and other areas.