“Knowledge counts but common sense matters.”

“Into the hands of common sense I confided the matter. Common sense, however, was as chilled and bewildered as all my other faculties, and it was only under the spur of an inexorable necessity that she spasmodically executed her trust.”

“He knew he should have counted. It was the rule to count to ten in his head before he opened his mouth. It was the rule to count to ten if he wanted to smash a man in the face for saying something he didn't like. It was the rule to count to ten if instinct wasn't needed, but common sense was.”

“The more you look at 'common knowledge', the more you realise that it is more likely to be common than it is to be knowledge.No real knowledge is common.”

“Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense.”

“Common sense and a sense of humor are the same thing, moving at different speeds. A sense of humor is just common sense, dancing.”