Theorems are eternal; their proofs are ephemeral.
定理是永恒的;它们的证明是短暂的。
The most important thing in communication is hearing what isn't said.
With a library you are free, not confined by temporary political climates. It is the most democratic of institutions because no one - but no one at all - can tell you what to read and when and how.
材料是有记忆的,它们承载着时间和故事。
最好的反应是那些第一次就能成功,并且每次都能成功的反应。