"The truth is rarely pure and never simple."

Heard melodies are sweet, but those unheard are sweeter.

永远不要满足于当前的成就，要不断追求更高目标。

采矿业必须发展以满足不断变化的世界的需求，否则将被淘汰。

Strengthen the female mind by enlarging it, and there will be an end to blind obedience.

数学是关于概念之间关系的科学，与这些概念的内容无关。