The founders of a new colony, whatever Utopia of human virtue and happiness they might originally project, have invariably recognized it among their earliest practical necessities to allot a portion of the virgin soil as a cemetery, and another portion as the site of a prison.
Mathematical intuition is like a muscle - it grows stronger with exercise.
如果你有一个好主意,并且你做得对,它就会成功。
真相是,我们都在寻找某种东西,但我们不知道它是什么。