Here are some quotes I've collected.

• It's too bad ignorance isn't painful.
• Diplomacy is the art of saying "nice doggie" until you can find a stick.

• Cela est bien dit, mais il faut cultiver notre jardin. Voltaire, Candide

• Surefire way to sculpt an elephant - First you get a big block of marble. Then you chip away everything that doesn't look like an elephant. George Bernard Shaw
• Fine sense and exalted sense are not half so useful as common sense. There are 40 men of wit for one of sense; and he that will carry nothing about him but gold will be every day at a loss for want of readier change. Alexander Pope
• Nothing is more dangerous than an idea, when you have only one. Alexander Pope
• Common sense is not so common. Voltaire
• It's easy to be brilliant if you're not concerned about being right. Hector McNeil