I also like:

“Between two groups of people who want to make inconsistent kinds of worlds, I see no remedy but force.”

— Oliver Wendell Holmes Jr.

To add:

“Nobody in the world, nobody in history, has ever gotten their freedom by appealing to the moral sense of the people who were oppressing them.” -Assata Shakur

Nonviolence declares that the American Indians could have fought off Columbus, George Washington, and all the other genocidal butchers with sit-ins; that Crazy Horse, by using violent resistance, became part of the cycle of violence, and was “as bad as” Custer. Nonviolence declares that Africans could have stopped the slave trade with hunger strikes and petitions, and that those who mutinied were as bad as their captors; that mutiny, a form of violence, led to more violence, and, thus, resistance led to more enslavement. Nonviolence refuses to recognize that it can only work for privileged people, who have a status protected by violence, as the perpetrators and beneficiaries of a violent hierarchy. -Peter Gelderloos

I have almost reached the regrettable conclusion that the Negro’s great stumbling block in his stride toward freedom is not the White Citizen’s Counciler or the Ku Klux Klanner, but the white moderate, who is more devoted to “order” than to justice; who prefers a negative peace which is the absence of tension to a positive peace which is the presence of justice; who constantly says: “I agree with you in the goal you seek, but I cannot agree with your methods of direct action”; who paternalistically believes he can set the timetable for another man’s freedom; who lives by a mythical concept of time and who constantly advises the Negro to wait for a “more convenient season.” -MLK

I just don’t believe that when people are being unjustly oppressed that they should let someone else set rules for them by which they can come out from under that oppression. -Malcolm X