"By all the rules of schoolboy history books, they were nonentities: they commanded no armies, sent no men to their deaths, ruled no empires, took little part in history-making decisions. A few of them achieved renown, but none was ever a national hero; a few were roundly abused, but none was ever quite a national villain.

What they did was more decisive for history than many acts of statesmen who basked in brighter glory, often more profoundly disturbing than the shuttling of armies back and forth across frontiers, more powerful for good and bad than the edicts of kings and legislatures. It was this: they shaped and swayed men’s minds."

- Robert Heilbroner, from The Worldly Philosophers: The Lives, Times and Ideas of the Great Economic Thinkers