不要在电子邮件中说任何你不愿意直接对某人说的关于某人的事情，因为最终他们会知道。
Don’t say anything about someone in email you would not be comfortable saying to them directly， because eventually they will read it.
Sustainability isn’t an option; it’s the only path forward.
In mathematics, as in life, the most elegant solutions often arise from a deep understanding of the problem.
The text is a tissue of quotations drawn from the innumerable centres of culture.