数学的研究就像空气或重力——它无处不在，你看不到它，但你知道它在那里。
The study of mathematics is like air or gravity—it is everywhere, and you can't see it, but you know it's there.
Writing is a way of making sense of the world. It's a way of imposing order on chaos.
说出口的，就是结束且完成的。
译文：不要因为很小的恶事就去做，也不要因为很小的善事就不去做。赏析：恶事虽小，但时间久了就会败坏人的品行。善事虽小，时间久了能提高人的品质。
The absence of alternatives clears the mind marvelously.