“Disarmament has become the urgent imperative of our time. I do not say this because I equate the absence of arms to peace, or because I believe that bringing an end to the nuclear arms race automatically guarantees the peace, or because the elimination of nuclear warheads from the arsenals of the world will bring in its wake that change in attitude requisite to the peaceful settlement of disputes between nations. Disarmament is vital today, quite simply, because of the immense destructive capacity of which men dispose.”
Address to the United Nations (1963)
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Haile Selassie 58
Emperor of Ethiopia 1892–1975Related quotes

Speech in Strasbourg, 11 May 1979.

1963, American University speech
Context: Some say that it is useless to speak of world peace or world law or world disarmament — and that it will be useless until the leaders of the Soviet Union adopt a more enlightened attitude. I hope they do. I believe we can help them do it. But I also believe that we must reexamine our own attitude — as individuals and as a Nation — for our attitude is as essential as theirs. And every graduate of this school, every thoughtful citizen who despairs of war and wishes to bring peace, should begin by looking inward — by examining his own attitude toward the possibilities of peace, toward the Soviet Union, toward the course of the cold war and toward freedom and peace here at home.

"Reaching Global Zero" (8 March 2011) http://www.huffingtonpost.com/valerie-plame-wilson/nuclear-proliferation_b_832399.html
Context: Without doubt, terrorist groups are trying to buy, build or steal a bomb. Furthermore, there is enough highly-enriched uranium (HEU) in the world to build more than 100,000 weapons, and rogue individuals are selling technology on the black market. If terrorists get hold of HEU, they could not be prevented from smuggling it into a targeted city, building a bomb and exploding it.
To my mind, the only realistic solution to this danger is to lock down all nuclear materials and eliminate all nuclear weapons in all countries: Global Zero. I am now dedicated to achieving this goal as a leader of the Global Zero movement. This movement was launched in December 2008 in Paris by an international group of 100 current and former heads-of-state, national security officials, military commanders and business, civic and faith leaders — and in just two years has grown to 300 leaders and 400,000 citizens worldwide.
The group believes that whatever deterrent value nuclear weapons had in the Cold War is now outweighed by the dangers of proliferation and nuclear terrorism. Our international Global Zero Commission has developed a practical, step-by-step plan to eliminate all nuclear weapons through phased and verified reductions.
To build on the progress made to date, we need a worldwide public movement to make Global Zero an urgent global imperative — and to bring all nuclear weapons countries to the table to negotiate multilateral nuclear arms reductions for the first time in history.

Saving Ourselves From Self-Destruction (2004)

From the homepage of his official website JohnDear.org http://johndear.org/ (2017).

1960s, The Quest for Peace and Justice (1964)

(18 December 1921).
I'm Glad You Asked Me That (2007)

“The arms race is a race between nuclear weapons and ourselves.”
"Introduction: Thinkability"
Einstein's Monsters (1987)

Broadcast to the Nation, 12 November 1984
Extracts from Speeches