做数学就是探索一个思想的宇宙，唯一的限制是你的想象力。
To do mathematics is to explore a universe of ideas, where the only limit is your imagination.
The passions that incline men to peace are fear of death, desire of such things as are necessary to commodious living, and a hope by their industry to obtain them.
幸福取决于我们自己。
写作是自我发现之旅，每个字都是接近理解我们存在本质的一步。