"The only limit to our realization of tomorrow will be our doubts of today."
The greatest discoveries often come from unexpected places.
我从未能写出一部快乐的戏剧。我不能。我可以写一部有趣的戏剧，但我不能写一部快乐的戏剧。
我不敢说数学和疯狂之间有直接关系，但毫无疑问，伟大的数学家都具有狂热的特质。
The teacher's task is not to implant facts but to place the subject to be learned in front of the learner and, through sympathy, emotion, imagination, and patience, to awaken in the learner the restless drive for answers and insights which enlarge the personal life.
The purpose of life is not to be happy. It is to be useful, to be honorable, to be compassionate, to have it make some difference that you have lived and lived well.