To a proprietor of a mine, the silver money is a produce with which he buys what he has occasion for. To all those through whose hands this silver afterwards passes, it is only the price of the produce which they themselves have raised by means of their property in land, their capitals, or their industry. In selling them they in the first place exchange them for money, and afterwards they exchange the money for articles of consumption.

Alas, how many have been persecuted for the wrong of having been right?

The manner in which things exist and take place, constitutes what is called the nature of things; and a careful observation of the nature of things is the sole foundation of all truth.

To a proprietor of a mine, the silver money is a produce with which he buys what he has occasion for. To all those through whose hands this silver afterwards passes, it is only the price of the produce which they themselves have raised by means of their property in land, their capitals, or their industry. In selling them they in the first place exchange them for money, and afterwards they exchange the money for articles of consumption.

Political economy has only become a science since it has been confined to the results of inductive investigation.

Nothing can be more idle than the opposition of theory to practice!

To the labor of man alone Smith ascribes the power of producing values. This is an error. A more exact analysis demonstrates... that all the values are derived from the operation of labor, or rather from the industry of man, combined with the operation of those agents which nature and capital furnish him.