Going out is not the goal, going deep is our real target.

有时候要大胆，有时候要小心，一个聪明人知道什么时候该怎么做。

The study of the mind must be strictly empirical.

The American farmer is the only man in our economy who has to buy everything he buys at retail, sell everything he sells at wholesale, and pay the freight both ways.

心灵因其所吸收的内容而成长。