“The only weapon that we have in our hands this evening is the weapon of protest. That's all.”
Montgomery Bus Boycott speech, at Holt Street Baptist Church (5 December 1955) http://www.blackpast.org/?q=1955-martin-luther-king-jr-montgomery-bus-boycott
1950s
Source: A Testament of Hope: The Essential Writings and Speeches
Context: We are here, we are here this evening because we're tired now. And I want to say that we are not here advocating violence. We have never done that. I want it to be known throughout Montgomery and throughout this nation that we are Christian people. We believe in the Christian religion. We believe in the teachings of Jesus. The only weapon that we have in our hands this evening is the weapon of protest. That's all.
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Martin Luther King, Jr. 658
American clergyman, activist, and leader in the American Ci… 1929–1968Related quotes

“We will continue to fight you as long as we have weapons in our hands.”
Audiotape aired on Al-Jazeera (18 October 2003) http://edition.cnn.com/interactive/world/0302/timeline.bin.laden.audio/content.13.html.
2000s, 2003

“We are born into this world unarmed - our mind is our only weapon.”
Source: Atlas Shrugged

“It ain't much, but it's the only weapon we have against the Greedheads.”
On voting, in "My 49er Habit" (4 November 2002), also published in Hey Rube : Blood Sport, the Bush Doctrine, and the Downward Spiral of Dumbness (2004)
2000s

Nobel lecture (2005)
Context: As long as some of us choose to rely on nuclear weapons, we continue to risk that these same weapons will become increasingly attractive to others.
I have no doubt that, if we hope to escape self-destruction, then nuclear weapons should have no place in our collective conscience, and no role in our security.
To that end, we must ensure — absolutely — that no more countries acquire these deadly weapons.
We must see to it that nuclear-weapon states take concrete steps towards nuclear disarmament.
And we must put in place a security system that does not rely on nuclear deterrence.

“Maybe we should develop a Crayola bomb as our next secret weapon. A happiness weapon.”
All I Really Need to Know I Learned in Kindergarten (1986)
Context: Maybe we should develop a Crayola bomb as our next secret weapon. A happiness weapon. A Beauty Bomb. And every time a crisis developed, we would launch one. It would explode high in the air — explode softly — and send thousands, millions, of little parachutes into the air. Floating down to earth — boxes of Crayolas. And we wouldn't go cheap either — not little boxes of eight. Boxes of sixty-four, with the sharpener built right in. With silver and gold and copper, magenta and peach and lime, amber and umber and all the rest. And people would smile and get a little funny look on their faces and cover the world with imagination instead of death. A child who touched one wouldn't have his hand blown off.