Liberal democracy may constitute the "end point of mankind's ideological evolution" and the "final form of human government," and as such constituted the "end of history."

In one minute you can change your attitude and in that minute you can change your entire day.

做一件事如果琢磨太久，就永远做不成。

"Mathematics is the science of patterns, and we study them to learn how to think logically, critically, and creatively."

要理解行为，就要寻找其中的效用。

You are never too old to chase your dreams.