In mathematics, as in life, the most profound discoveries often come from asking the simplest questions.
当你不再感到伤心的时候(时间会冲淡一切伤痛),你就会因认识我而感到心满意足。你是我永远的朋友。将会和我一起欢笑。为了欢乐,你会经常打开窗子……
It is vain to talk of the interest of the community, without understanding what is the interest of the individual.