XXXI.

"The ideas of economists and political philosophers, both when they are right and when they are wrong, are more powerful than is commonly understood... Practical men, who believe themselves to be quite exempt from any intellectual influences, are usually the slave of some defunct economist. Madmen in authority, who hear voices in the air, are distilling their frenzy from some academic scribbler of a few years back."

© John Maynard Keynes
"The General Theory of Employment" (1935)