The primary rules of obligation are those that require or forbid certain actions.

Leadership is about empowering others to achieve what they thought was impossible.

自我不是现成的东西，而是通过行动选择不断形成的东西。

科学不仅仅是发现，更是责任。

A verdadeira viagem de descobrimento não consiste em procurar novas paisagens, mas em ter novos olhos.

故事中最重要的不是发生了什么，而是为什么会发生。