“But if you don’t know anything about Cathy, I don’t see how any theory will help.”
Vadez sighed, not unpleasantly…“My friend, if you know all about Cathy, do you think you would be able to find her?”
“I’m sure I could,” Marvin said.
“Even without knowing the Theory of Searches?”
“Well then, apply the same reasoning to the reverse condition. I know all there is to know about the Theory of Searches, and therefore I need to know nothing about Cathy.”