“I must deal immediately and at some length with the question of violence. Some of the things so far told to the Court are true and some are untrue. I do not, however, deny that I planned sabotage. I did not plan it in a spirit of recklessness, nor because I have any love of violence. I planned it as a result of a calm and sober assessment of the political situation that had arisen after many years of tyranny, exploitation, and oppression of my people by the Whites.”
1960s, I am Prepared to Die (1964)
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Nelson Mandela 143
President of South Africa, anti-apartheid activist 1918–2013Related quotes

Heart-to-Heart Talks with Philistines by the Pastor of His Flock http://books.google.com/books?id=4k8LAQAAIAAJ&q=%22we+are+moving+so+fast+that+when+plans+are+being+made+to+perform+some+great+feat+these+plans+are+broken+into+by+a+youth+who+enters+and+says+I+have+done+it%22&pg=PA178#v=onepage, The Philistine magazine, May 1913
As quoted in The Treasury of Humorous Quotations (1951) by Evan Esar, p. 103
As quoted in More Random Walks In Science : An Anthology (1982) by Robert L. Weber, p. 109.
Variant: The world is moving so fast these days that the man who says it can't be done is generally interrupted by someone doing it.
Variant: In these days, a man who says a thing cannot be done is quite apt to be interrupted by some idiot doing it.

Press Conference http://georgewbush-whitehouse.archives.gov/news/releases/2007/01/20070126.html introducing General David Petraeus as the new commander of the Multinational Force Iraq (January 26, 2007)
2000s, 2007

The Philippine Daily Inquirer http://newsinfo.inquirer.net/696814/ive-never-been-part-of-liberal-party-escudero
2012
Cooper vs. Terrorism https://www.sightm1911.com/lib/ccw/Cooper_vs_Terrorism.htm
Variant: One bleeding-heart type asked me in a recent interview if I did not agree that "violence begets violence." I told him that it is my earnest endeavor to see that it does. I would like very much to ensure — and in some cases I have — that any man who offers violence to his fellow citizen begets a whole lot more in return than he can enjoy.
against women
About the 2014 protest on the acid attacks on women in Isfahan. As quoted in Protesters Deploring Acid Attacks against Women Are Beaten and Arrested https://www.iranhumanrights.org/2014/10/protesters-acid-attacks/?_sm_au_=iVVj7fBvFSWnQjmQ (October 24, 2014), Center for Human Rights in Iran.

1990s, I Am a Man, a Black Man, an American (1998)

“I have no plans, and no plans to plan.”
On his presidential plans New York Times (14 September 1986)

Herzog on Herzog (2002), On Klaus Kinski