It is far easier to give a talk that skims over the surface than to dig down for facts. But when you take the easy way you make little or no impression on the audience. After you have narrowed your subject, then the next step is to ask yourself questions that will deepen your understanding and prepare you to talk with authority on the topic you have chosen: “Why do I believe this? When did I ever see this point exemplified in real life? What precisely am I trying to prove? Exactly how did it happen?”
