To all this add the multiplicity of unhealthy trades, which shorten men's lives or destroy their bodies, such as working in the mines, and the preparing of metals and minerals, particularly lead, copper, mercury, cobalt, and arsenic: add those other dangerous trades which are daily fatal to many tilers, carpenters, masons and miners: put all these together and we can see, in the establishment and perfection of societies, the reasons for that diminution of our species, which has been noticed by many philosophers. Luxury, which cannot be prevented among men who are tenacious of their own convenience and of the respect paid them by others, soon completes the evil society had begun, and, under the pretence of giving bread to the poor, whom it should never have made such, impoverishes all the rest, and sooner or later depopulates the State. Luxury is a remedy much worse than the disease it sets up to cure; or rather it is in itself the greatest of all evils, for every State, great or small: for, in order to maintain all the servants and vagabonds it creates, it brings oppression and ruin on the citizen and the labourer; it is like those scorching winds, which, covering the trees and plants with devouring insects, deprive useful animals of their subsistence and spread famine and death wherever they blow. From society and the luxury to which it gives birth arise the liberal and mechanical arts, commerce, letters, and all those superfluities which make industry flourish, and enrich and ruin nations. The reason for such destruction is plain. It is easy to see, from the very nature of agriculture, that it must be the least lucrative of all the arts; for, its produce being the most universally necessary, the price must be proportionate to the abilities of the very poorest of mankind. From the same principle may be deduced this rule, that the arts in general are more lucrative in proportion as they are less useful; and that, in the end, the most useful becomes the most neglected. From this we may learn what to think of the real advantages of industry and the actual effects of its progress.