When you want to help people, you tell them the truth. When you want to help yourself, you tell them what they want to hear.

Men become civilized, not in proportion to their willingness to believe, but in proportion to their readiness to doubt.

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。