一个人的价值或价值，就像所有其他事物一样，是他的价格；也就是说，为了使用他的力量而愿意付出的代价。

Leadership is about making others better as a result of your presence and making sure that impact lasts in your absence.

最伟大的礼物是对阅读的热情。

Mathematics is not just a human invention; it has a deep reality that exists independently of us.

Farmers are the original environmentalists—they understand the land better than anyone.

如果你想理解一个系统，试着改变它。