The Wealth of Nations by Part 4 Chapter 1 Page 27

It would be too ridiculous to go about seriously to prove that wealth does not consist in money, or in gold and silver; but in what money purchases, and is valuable only for purchasing. Money, no doubt, makes always a part of the national capital; but it has already been shown that it generally makes but a small part, and always the most unprofitable part of it.

It is not because wealth consists more essentially in money than in goods that the merchant find it generally more easy to buy goods with money than to buy money with goods; but because money is the known and established instrument of commerce, for which everything is readily given in exchange, but which is not always with equal readiness to be got in exchange for everything. The greater part of goods, besides, are more perishable than money, and he may frequently