Memories, even your most precious ones, fade surprisingly quickly. But I don’t go along with that. The memories I value most, I don’t ever see them fading.

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.

每个独裁者的梦想都是把他的国家变成一个没有围墙的监狱。

我们不能把问题留给下一代解决，我们现在就必须尽自己的一份力。

你知道的越多，你就越意识到你不知道的越多。