没有完美的知识可以称为我们与生俱来的；唯有从经验中获得的知识才是真正的知识。
There is no perfect knowledge which can be entitled ours, that is innate; none but what has been obtained from experience.
Economics is ultimately about improving human welfare.
What of soul was left, I wonder, when the kissing had to stop?
Man is the artisan of his own happiness.
最危险的敌人往往是我们自己。