Confidence isn't optimism or pessimism, and it's not a character attribute. It's the expectation of a positive outcome.

In mathematics, there are no shortcuts.

A mathematical truth is universal and eternal.

The goal of economics is to understand how to allocate scarce resources in the most efficient way possible.

We are all exiles from someplace, even if it's from our own childhood.

知识最大的敌人不是无知，而是知识的幻觉。