选择理论忽略了大多数人类行为是基于习惯而非精心计算的决策这一事实。

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！"

我不喜欢压力。我不喜欢债务。我不喜欢担心。所以我尽量买足够便宜的东西，这样如果它们不奏效，我也不会损失太多。

唯一能阻止我的人就是我自己。

人通过克服困难而成长。