实现明天的唯一限制是我们今天的疑虑。
"The only limit to our realization of tomorrow is our doubts of today."
The world is a book, and those who do not travel read only one page.
"You miss 100% of the shots you don't take."
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."
用你所拥有的，在你所在的地方，做你能做的事。
"The more you try to understand, the less you know."