认为贞洁是一种美德是人类心灵的迷信之一。
It is one of the superstitions of the human mind to have imagined that virginity could be a virtue.
Every tyrant who has lived has believed in freedom--for himself.
The art of pricing is not in setting the price, but in designing the process that reveals the true value.
对心灵的研究必须基于直接观察。