“Humanity takes itself too seriously. It is the world's original sin. If cavemen had known how to laugh, history would have been different.”

As quoted in The Tyrants : 2500 Years of Absolute Power and Corruption (2006) by Clive Foss ISBN 1905204965
Attributed

The Transhumanism Handbook, 2019

India became a sporting nation in the last decade: Kumble

Henry, Act II, scene V
Source: The Real Thing (1982)
Context: Buddy Holly was twenty-two. Think of what he might have gone on to achieve. I mean, if Beethoven had been killed in a plane crash at twenty-two, the history of music would have been very different. As would the history of aviation, of course.

1963, American University speech
Context: Let us reexamine our attitude toward the cold war, remembering that we are not engaged in a debate, seeking to pile up debating points. We are not here distributing blame or pointing the finger of judgment. We must deal with the world as it is, and not as it might have been had the history of the last 18 years been different. We must, therefore, persevere in the search for peace in the hope that constructive changes within the Communist bloc might bring within reach solutions which now seem beyond us. We must conduct our affairs in such a way that it becomes in the Communists' interest to agree on a genuine peace. Above all, while defending our own vital interests, nuclear powers must avert those confrontations which bring an adversary to a choice of either a humiliating retreat or a nuclear war. To adopt that kind of course in the nuclear age would be evidence only of the bankruptcy of our policy — or of a collective death-wish for the world. To secure these ends, America's weapons are nonprovocative, carefully controlled, designed to deter, and capable of selective use. Our military forces are committed to peace and disciplined in self- restraint. Our diplomats are instructed to avoid unnecessary irritants and purely rhetorical hostility. For we can seek a relaxation of tension without relaxing our guard. And, for our part, we do not need to use threats to prove that we are resolute. We do not need to jam foreign broadcasts out of fear our faith will be eroded. We are unwilling to impose our system on any unwilling people — but we are willing and able to engage in peaceful competition with any people on earth.

The Origin of Humankind (1994)

Source: Our Enemy, the State (1935), p. 44

Speech in the Reichstag (6 June 1924) on foreign loans to Germany, quoted in W. M. Knight-Patterson, Germany. From Defeat to Conquest 1913-1933 (London: George Allen and Unwin, 1945), p. 348
1920s

Source: Disturbing the Peace (1986), Ch. 2 : Writing for the Stage