The ideas of economists and political philosophers, both when they are right and when they are wrong, are more powerful than is commonly understood. Indeed the world is ruled by little else. Practical men, who believe themselves to be quite exempt from any intellectual influence, are usually the slaves of some defunct economist.

Intelligence and Intellectuals

Nothing mattered except states of mind, chiefly our own.

Money

The importance of money flows from it being a link between the present and the future.