When the facts change, I change my mind - John Maynard Keynes

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 influences, are usually the slaves 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...But, soon or late, it is ideas, not vested interests, which are dangerous for good or evil.

It is not true that individuals possess a prescriptive "natural liberty" in their economic activities. There is no "compact" conferring perpetual rights on those who Have or on those who Acquire.

Leninism is a combination of two things which Europeans have kept for some centuries in different compartments of the soul — religion and business. We are shocked because the religion is new, and contemptuous because the business, being subordinated to the religion instead of the other way round, is highly inefficient.