“I would rather be vaguely right than precisely wrong.”

“It is better to be roughly right than precisely wrong.”

“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 slaves of some defunct economist.”

“When somebody persuades me I am wrong, I change my mind.”

“I find economics increasingly satisfactory, and I think I am rather good at it. I want to manage a railroad or organise a Trust or at least swindle the investing public”

“Newton was not the first of the age of reason. He was the last of the magicians, the last of the Babylonians and Sumerians, the last great mind that looked out on the visible and intellectual world with the same eyes as those who began to build our intellectual inheritance rather less than 10,000 years ago.”

“Markets can remain irrational longer than you can remain solvent.”