To study the phenomena of mind from the standpoint of the soul is nothing less than the way to perfect knowledge.

The poet is the brother of the dreamer and the madman.

The behavior of the whole cannot be predicted from the behavior of its parts taken separately.

自由的代价是永恒的警惕。

商业成功的关键不仅仅是满足客户，而是要超越他们的期望。