What we learn from history is that people don't learn from history.

教育的艺术必须从教育的科学中汲取其法则。

To tax the larger incomes at a higher percentage than the smaller， is to lay a tax on industry and economy； to impose a penalty on people for having worked harder and saved more than their neighbors.

Leadership in conservation isn’t about control; it’s about stewardship and long-term vision.

我对金钱或名誉不感兴趣；我不想像动物园里的动物一样被展示。