The power of mathematics lies in its generality and abstraction.
數(shù)學(xué)的力量在于它的普遍性和抽象性。
幸福不是現(xiàn)成的東西，它來自于你自己的行動。
如果你理解，那就不是上帝。
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.