经验给我们太多的教训，告诉我们人类最难管制 的东西，莫过于自己的舌头。(荷兰哲学家 斯宾诺沙 B)
Experience never misleads; what you are missed by is only your judgement, and this misleads you by anticipating results from experience of a kind that is not produced by your experements. (Leonardo Da Vinci, Italian painter)