数学中最深刻的发现往往来自于对最基本假设的质疑。
The most profound discoveries in mathematics often come from questioning the most basic assumptions.
The most powerful weapon on earth is the human soul on fire.
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.
在数学中，提出问题的艺术必须比解决问题更有价值。