In mathematics, you don't understand things. You just get used to them.
The only truly secure system is one that is powered off, cast in a block of concrete and sealed in a lead-lined room with armed guards - and even then I have my doubts.
書籍是最安靜、最恒久的朋友；它們是最易接近、最睿智的顧問，也是最耐心的老師。
The Langlands program is a framework for exploring the deepest questions in mathematics.
"The books that the world calls immoral are books that show the world its own shame."