Since materials are destroyed as such by being once used, the whole of the labour required for their production, as well as the abstinence of the person who supplied the means for carrying it on, must be remunerated from the fruits of that single use.

• 既然原料一经使用就会毁灭，所以为生产它们所需的全部劳动，以及提供生产手段的人的节欲，都必须从这种使用所产生的成果中得到报酬。