To do mathematics is to explore a universe of ideas, where the only limit is your imagination.

You must change nothing in your writing without absolute necessity. If it is necessary， then change with simplicity.

真正的热情不知道限制或障碍。

伟大不是成为最好的，而是比以前的自己更好。

"The worst form of tyranny is the one that disguises itself as freedom."

Diplomacy requires enduring patience and steadfast determination to drive the resolution of complex issues.