“Economists often talk about the 80/20 Principle, which is the idea that in any situation roughly 80 percent of the “work” will be done by 20 percent of the participants. In most societies, 20 percent of criminals commit 80 percent of crimes. Twenty percent of motorists cause 80 percent of all accidents. Twenty percent of beer drinkers drink 80 percent of all beer. When it comes to epidemics, though, this disproportionality becomes even more extreme: a tiny percentage of people do the majority of the work.”

“If you give only 80 percent leadership, your dog will give you 80 percent following. And the other 20 percent of the time he will run the show. If you give your dog any opportunity for him to lead you, he will take it.”

“I'm probably 20 percent atheist and 80 percent agnostic. I don't think anyone really knows. You'll either find out or not when you get there, until then there's no point thinking about it.”

“10 percent of any population is cruel, no matter what, and 10 percent is merciful, no matter what, and the remaining 80 percent can be moved in either direction.”

“Spend 80 percent of your time on books and 20 percent on articles and newspapers. And by books, I don’t mean just any book. I mean hardcovers. A paperback is made to be read. A hardcover is made to be studied. There’s a huge difference.”

“The best rush in the world is getting something at 80 percent off.”