Sometimes the most profound mathematics comes from playing with simple ideas until they reveal their hidden complexity.

The books that we reread the most are the ones that most clearly describe the world we already know.

A well-designed deposit insurance system can prevent bank runs without creating excessive moral hazard.

在数学研究中，坚持是关键；许多伟大的成果来自于一遍又一遍地从不同角度看待同一个问题。