任何真正新颖的东西都是在一个人的青年时期发明发现出来的，当一个人变得更有经验，更有名，也更顽固。
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.
I earnestly wish to point out in what true dignity and human happiness consists.
