Book smarts vs. common sense - Intelligence thunderdome.

[Keyser Soze]

I think Dent is referring to a special type of intelligence called "Reasoning", people who can pick up patterns are this type as well. To determine or conclude by logical thinking. I don't know if thats common sense per-se though, that requires intelligence.

I think theres a flipside to the booksmart people having no common sense. People who are dumb often think they are overflowing with common sense, its almost like a defense mechanism for them.