“This is ten percent luck, Twenty percent skill, Fifteen percent power of will, Five percent pleasure, Fifty percent pain, and a hundred percent reason to remember the name.”

“People who read me seem to be divided into four groups: twenty-five percent like me for the right reasons; twenty-five percent like me for the wrong reasons; twenty-five percent hate me for the wrong reasons; twenty-five percent hate me for the right reasons. It's that last twenty-five percent that worries me.”

“People learn twenty-five percent from their teacher, twenty-five percent from listening to themselves, twenty-five percent from their friends, and twenty-five percent from time.”

“Fifty percent of something is better than than one hundred percent of nothing.”

“Five percent of the people think; ten percent of the people think they think; and the other eighty-five percent would rather die than think.”

“...it is fifty percent what they see, and fifty percent what they think they see.”

“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.”