Mathematics is not a careful march down a well-cleared highway, but a journey into a strange wilderness, where the explorers often get lost.
宇宙不仅比我们想象的更奇怪,它比我们能想象的还要奇怪。
释义:喜欢指责别人的人,难以维持长久的友谊;常常宽恕自己的人,不容易改正错误。