感官有时会欺骗我们，因此永远不要完全信任那些曾经欺骗过我们的人，这是明智的。
在无限中失去自我是最高的自由。
The mathematician does not study pure mathematics because it is useful; he studies it because he delights in it and he delights in it because it is beautiful.
对认可的渴望是最基本的人类渴望，它是人类历史上最伟大成就和最伟大悲剧的源泉。
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.