Who said “Has there ever been a society which has died of dissent? Several have died of conformity…”?

“Discussion in America means dissent.”

“May we never confuse honest dissent with disloyal subversion.”

“The rule is perfect: in all matters of opinion our adversaries are insane.”

“It is hard for any one to be an honest politician who is not born and bred a Dissenter.”

“The beginning of thought is in disagreement -- not only with others but also with ourselves.”

“Power is the by-product of understanding.”

“The hand is the cutting edge of the mind.”

“No science is immune to the infection of politics and the corruption of power.”

“We gain our ends only with the laws of nature; we control her only by understanding her laws.”

“The world can only be grasped by action, not by contemplation. The hand is the cutting edge of the mind.”

“That is the essence of science: ask an impertinent question, and you are on the way to a pertinent answer.”