The young do not know enough to be prudent, and therefore they attempt the impossible – and achieve it, generation after generation.

In mathematics, the art of proposing a question must be held of higher value than solving it.

我宣布，毕竟没有什么能比阅读更令人愉快的了！任何事物，人们对它的厌倦远远不如对一本书的厌倦来得快。