The difference between animals and humans is that humans are capable of reasoning, but even that is unreliable.
忧愁在我心中沉寂平静,正如黄昏在寂静的林中。
"I am free, no matter what rules surround me. If I find them tolerable, I tolerate them; if I find them too obnoxious, I break them. I am free because I know that I alone am morally responsible for everything I do."