正如几何学最自然的起点是数学点，在观察和自然历史中采用同样的方法也最真实、简单且富有教益。
As in geometry the most natural way of beginning is from a mathematical point, so is the same method in observations and natural history the most genuine, simple, and instructive.
All our knowledge merely helps us to die a more painful death than the animals that know nothing.
历史不仅仅是关于过去；它是关于过去如何塑造现在。
The most important victories are the ones that come after the toughest defeats.
I don't rap for dead presidents; I'd rather see the president dead.
你在20多岁时做出的选择将塑造你未来几十年的生活。