病困乃重良医，世乱而贵忠贞。
出自《抱朴子·广訾》。病到很急的时候就会觉得良医是重要的了，世道动乱的时候就会觉得忠贞的臣子是重要的了。
The best ideas come as jokes. Make your thinking as funny as possible.
Collaboration between governments, businesses and society is essential to tackle climate change.
战争即和平。自由即奴役。无知即力量。
The pursuit of mathematical knowledge is a journey that never ends, filled with endless curiosity and wonder.