The mathematician does not study pure mathematics because it is useful; he studies it because he delights in it and he delights in it because it is beautiful.

The world needs energy, but it needs responsible energy more than ever.

Peace is not free, it requires constant effort to maintain.

我在打扫房间，打扫身体，扩大我的心脏。

We don't inherit the oceans from our ancestors; we borrow them from our children.

理智是法律的灵魂；法律的理智是灵魂。

农民是最早的环保主义者——他们比任何人都更了解土地。