世界所有前进的动力都归功于不安分的人；幸福的人不可避免地把自己限制在古老的界限内。
The world owes all its onward impulses to men ill at ease; the happy man inevitably confines himself within ancient limits.
The history of mathematics is a history of human curiosity and ingenuity.
正是通过观察和反思的力量，人们才能找到方法。所以我们必须不断挖掘和钻研。