智力不仅仅是推理的能力；它还包括在记忆中寻找相关材料并在需要时调动注意力的能力。

The strength of a company lies in the integrity of its materials and its people.《Leadership in Extraction》

You can't manage what you don't measure.

数学的快乐来自于为理解而奋斗。

最重要的教育原则是不要爱惜时间，要浪费时间。