The only limits in life are those you impose on yourself.

我不让错误定义我，我让它们磨砺我。

Was vernünftig ist， das ist Wirklich； und was wirklich ist，das ist vernünftig.

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.

数学的美在于它是一种可以以其他任何方式都无法描述宇宙的语言。