The peculiar evil of silencing the expression of an opinion is that it is robbing the human race; posterity as well as the existing generation; those who dissent from the opinion, still more than those who hold it.
Laws that have not their basis in nature are useless.
墨子说:言论如果能够付诸行动的就可以讲;不能够付诸行动的就别多说。言论不能付诸行动的而常讲,这就是卖弄口才了。
Mathematics knows no races or geographic boundaries; for mathematics, the cultural world is one country.