“A study of the history of opinion is a necessary preliminary to the emancipation of the mind.”

“Ideas shape the course of history.”

“How long will it be necessary to pay City men so entirely out of proportion to what other servants of society commonly receive for performing social services not less useful or difficult?”

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

“When the facts change, I change my mind - what do you do, sir?”

“But my lord, when we addressed this issue a few years ago, didn't you argue the other side?" He said, "That's true, but when I get more evidence I sometimes change my mind. What do you do?”

“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.”