Adam Smith on Progressive Taxation

Ran across this gem from "The Wealth of Nations", which is pretty much the instruction manual for capitalism:

"the expense of defending the society, and that of supporting the dignity of the chief magistrate, are both laid out for the general benefit of the whole society. It is reasonable, therefore, that they should be defrayed by the general contribution of the whole society, all the different members contributing, as nearly as possible, in proportion to their respective abilities."

"When the toll upon carriages of luxury, upon coaches, post-chaises, &c. is made somewhat higher in proportion to their weight, than upon carriages of necessary use, such as carts, waggons, &c. the indolence and vanity of the rich is made to contribute in a very easy manner to the relief of the poor, by rendering cheaper the transportation of heavy goods to all the different parts of the country."