Violence is the use of physical force to apply a state to others contrary to their wishes. (Physical) violence, while often a stand-alone issue, is often the culmination of other kinds of conflict, e.g. a father may beat his child up when his patience is exhausted, or two countries may war with each other when diplomatic (political) efforts are exhausted, or a victim of emotional violence may "snap" and attempt to kill their tormentor.

Violence is the last refuge of the incompetent.

Isaac Asimov, Foundation series|Foundation, Astounding Science-Fiction, May 1942, (This appears three times in "Bridle and Saddle" which is titled "The Mayors" in Foundation (novel)|the 1951 novelization). It plays on the famous quote by Samuel Johnson (1775): "Patriotism is the last refuge of a scoundrel."

No matter what someone else has done, it still matters how we treat people. It matters to our humanity that we treat offenders according to standards that we recognize as just. Justice is not revenge — it's deciding for a solution that is oriented towards peace, peace being the harder but more human way of reacting to injury. That is the very basis of the idea of rights.

Judith Butler, The Believer Magazine (magazine)|The Believer, Interview - Issue 2

Peace is a resistance to the terrible satisfactions of war.

Judith Butler, The Believer Magazine (magazine)|The Believer, Interview - Issue 2

"I wish your revolt well, my friend," said Bakhtin, "but beware that you don't end up merely repeating the same old story. The state abhors only one thing in the end, and that's the sound of laughter. Violence it can understand."

Terry Eagleton|Terry Eagleton, Saints and Scholars, Chapter 4 (1987)

Violence is man re-creating himself.

Frantz Fanon|Frantz Fanon, The Wretched of the Earth|The Wretched of the Earth, Chapter 1 (1961)

Violence, naked force, has settled more issues in history than has any other factor, and the contrary opinion is wishful thinking at its worst.

Robert A. Heinlein, in Starship Troopers (1959)

The most heterogeneous ideas are yoked by violence together.

Dr. Samuel Johnson|Samuel Johnson, Lives of the Most Eminent English Poets|Lives of the Most Eminent English Poets, "Cowley" (1781)

... violence is the whole essence of authoritarianism, just as the repudiation of violence is the whole essence of anarchism.

Errico Malatesta, "Anarchism, Authoritarian Socialism and Communism" in What Is Anarchism?: An Introduction by Donald Rooum, ed. (London: Freedom Press, 1992, 1995) p. 59.