I think prime numbers are like life. They are very logical but you could never work out the rules, even if you spent all your time thinking about them.
除非有勇气远离海岸,否则你永远游不到新的地平线。
The natural price of labor is that price which is necessary to enable the laborers, one with another, to subsist and to perpetuate their race, without either increase or diminution.
国际政治是一项残酷而危险的事务,而且很可能继续保持这种状态。
We are the products of countless chance events.