International politics is a brutal and unforgiving arena, where states constantly strive to maximize their power and security.

一年规划，没有比种植五谷更好的；十年规划，没有比种植树木更好的；终身规划，没有比培养人才更好的。

The only real progress lies in learning to be wrong all alone.

先验真理并不一定是独立于经验而知的真理。