交换、交易和互换的倾向普遍存在于所有人之中，而在其他动物种族中找不到。
The propensity to truck， barter， and exchange one thing for another is common to all men， and to be found in no other race of animals.
If we don't believe in freedom of expression for people we despise, we don't believe in it at all.
The arts are a way of making sense of the world.
我们都有缺陷，那是光照进来的地方。
Science knows no country, because knowledge belongs to humanity, and is the torch which illuminates the world.
可持续性是畜牧养殖的唯一前进道路——没有其他选择。