From A Connecticut Yankee in King Arthur’s Court:
I rather wished I had gone some other road. This was not the sort of experience for a statesman to encounter who was planning out a peaceful revolution in his mind. For it could not help bringing up the unget-aroundable fact that, all gentle cant and philosophizing to the contrary notwithstanding, no people in the world ever did achieve their freedom by goody-goody talk and moral suasion: it being immutable law that all revolutions that will succeed must begin in blood, whatever may answer afterward. If history teaches anything, it teaches that. What this folk needed, then, was a Reign of Terror and a guillotine, and I was the wrong man for them.