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Combinatorics is like the art of counting without actually counting.
The best way to learn mathematics is to do mathematics.
It's not what you're looking for trouble, but something that you're not sure of, but in fact, it's not.
故事永远不会结束,它只是在等待下一个讲述者。
The passion to be reckoned upon is fear.
Discipline is the bridge between goals and accomplishment.
给我一打健康的婴儿,以及我指定的养育环境,我保证能把其中随机选出的任何一个训练成我选定的任何类型的专家——医生、律师、艺术家、商人,甚至乞丐和小偷,不论他的天赋、爱好、倾向、能力、职业和种族。