你无法回到过去改变开头，但可以从现在开始改变结局。

Sometimes you have to be knocked down lower than you have ever been to stand back up taller than you ever were.

Every mental state corresponds to a specific brain state.

幸福不是现成的东西，它来自于你自己的行动。

The success of an enterprise is not accidental, but inevitable.

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."

领导力是激励他人实现他们认为不可能的事情。

乐观主义者倾向于将他们的麻烦解释为暂时的、可控的和特定于一种情况的。另一方面，悲观主义者认为他们的麻烦会永远存在，破坏他们所做的一切，并且无法控制。

在所有人类的痛苦中，最苦涩的是：知道得太多却无法控制任何事情。