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.

树木有根则繁茂，根腐则树枯萎；鱼有水才能活，水干涸了鱼则必死；灯有油才光亮，油尽则灯灭。人有真精神，保护则长寿，戕害则必死。

逻辑法则不是心理法则，而是真理的法则。

真相很残酷。一旦给狗戴上皇冠，就很难给它戴上项圈了。

现代农业必须兼顾效率和道德。