The increase of national wealth depends chiefly upon the increase of production.
数学是关于概念之间关系的科学,与这些概念的内容无关。
That neither our thoughts, nor passions, nor ideas formed by the imagination, exist without the mind, is what every body will allow.
The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.
In the future, everyone will be world-famous for 15 minutes.