A good sentence should have a kind of tension in it.

幸福是一种心态，而不是一系列环境。

Facts are stubborn things; and whatever may be our wishes, our inclinations, or the dictates of our passion, they cannot alter the state of facts and evidence.

恐惧让你沦为囚犯，希望让你重获自由。

Core technologies cannot be bought; they must be developed independently.