At that age， I'd take any excuse to make estimates and do minor arithmetic. I'd calculate our gas mileage -- figure out useless statistics on things like grocery spending. I'd been hearing an ad campaign about smoking. I can't remember the details， but basically the ad said， every puff of a cigarette takes some number of minutes off of your life: I think it might have been two minutes per puff. At any rate， I decided to do the math for my grandmother. I estimated the number of cigarettes per days， estimated the number of puffs per cigarette and so on. When I was satisfied that I'd come up with a reasonable number， I poked my head into the front of the car， tapped my grandmother on the shoulder， and proudly proclaimed， "At two minutes per puff， you've taken nine years off your life！"

翻译：每个人都有局限，不责备他人做不到的事，不强迫他人做力所不及的事，是待人的分寸。

以宽恕自己的心宽恕别人，则交情深；以责备他人的心责备自己，则过错少。

"The truth is rarely pure and never simple."

Paranoia is just another word for ignorance.

领导力不是发号施令，而是激励他人成就伟大。

网球是一项心理游戏。每个人都很健康，每个人都能打出漂亮的正手和反手。

无知比知识更容易出现。