The greatest obstacle to being heroic is the doubt whether one may not be going to prove one's self a fool; the truest heroism is to resist the doubt; and the profoundest wisdom, to know when it ought to be resisted, and when to be obeyed.
一个物理符号系统具备一般智能行为的必要和充分条件。
未来不是现在提供的替代路径中选择的结果，而是一个被创造的地方——首先在思想和意志中创造，然后在活动中创造。
我们花了很多时间教领导者该做什么，却没有花足够的时间教他们该停止什么。
You miss 100% of the shots you don't take.