"Mathematics, rightly viewed, possesses not only truth, but supreme beauty - a beauty cold and austere, like that of sculpture."

"Men who are unhappy, like men who sleep badly, are always proud of the fact."

"A sense of duty is useful in work, but offensive in personal relations. People wish to be liked, not be endured with patient resignation."

"Religion is something left over from the infancy of our intelligence, it will fade away as we adopt reason and science as our guidelines."

"To be able to fill leisure intelligently is the last product of civilization, and at present very few people have reached this level."

"Mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true."

"Guard well your spare moments. They are like uncut diamonds. Discard them and their value will never be known. Improve them and they will become the brightest gems in a useful life."

"Impossible is a word only to be found in the dictionary of fools."

"Habit is necessary; it is the habit of having habits, of turning a trail into a rut, that must be incessantly fought against if one is to remain alive."

"At twenty a man is full of fight and hope. He wants to reform the world. When he is seventy he still wants to reform the world, but he knows he can't."

"A genius is just a talented person who does his homework."

"A man is so in the way in the house."