在数学中，就像在生活中一样，最深刻的发现往往来自于提出最简单的问题。
In mathematics, as in life, the most profound discoveries often come from asking the simplest questions.
1923年对广州国民党员的演说
The only relationship that can make both partners happy is one in which sentimentality has no place and neither partner makes any claim on the life and freedom of the other.
I'm not a teacher, I'm a student.
"A book is a mirror: if an ape looks into it, an apostle is unlikely to look out."
Sustainability isn't an option—it's the only path forward for any industry that wants to thrive in the future.