The wilderness is the greatest teacher. It doesn’t give you answers, but it shows you how to find them.

The time of life is limited and unchangeable, so it is necessary to use every minute efficiently. Not using it well is a waste.

I always cheer up immensely if an attack is particularly wounding because I think, well, if they attack one personally, it means they have not a single political argument left.

数学不知道种族或地理界限；对于数学来说，文化世界是一个国家。

Optimism is not just a trait; it's a skill that can be cultivated.