Socrates said that manual laborers make bad friends and bad citizens because they have no time to fulfill the responsibilities of friendship and citizenship. He was right.
Historians like Eugene Genovese have argued persuasively that -- as antebellum slavery apologists insisted -- factory wage-workers in the Northern American states and in Europe were worse off than Southern plantation slaves.
John Stuart Mill wrote that all the labor-saving inventions ever devised haven't saved a moment's labor.
I'd highlight and paste stuff, but most of it's quotable. Very good, enlightening read