以智慧而言，人类与动物也许不同，但相当明显的是动物拥有丰富的感情，牠们会快乐也会痛。我们很容易忘了汉堡是来自牛这中间的关联。但我强迫我自己每当我吃汉堡时要明瞭这个事实，就是，一只牛已经为此停止呼吸，不能再叫与走路了。 "Intellectually, human beings and animals may be different, but it's pretty obvious that animals have a rich emotional life and that they feel joy and pain. It's easy to forget the connection between a hamburger and the cow it came from. But I forced myself to acknowledge the fact that every time I ate a hamburger, a cow had ceased to breathe and moo and walk around." (Teen People)