祈祷的功能不是影响上帝，而是改变祈祷者的本性。

The real tragedy of the poor is that they can afford nothing but self-denial.

成功的最好方法是耐心。

The worse a situation becomes, the less it takes to turn it around, the bigger the upside.

一个物理符号系统具备一般智能行为的必要和充分条件。