Violence as a way of achieving racial justice is both impractical and immoral. I am not unmindful of the fact that violence often brings about momentary results. Nations have frequently won their independence in battle. But despite temporary victories, violence never brings permanent peace. [...] It is immoral because it seeks to humiliate the opponent rather than win his understanding: it seeks to annihilate rather than convert. [...]

-- Dr. M. L. King

Full speech:
https://www.nobelprize.org/prizes/peace/1964/king/lecture/