The discontent, rebelliousness, bitterness, and violence on the part of workers in industry which we have seen rising like a tide through the past century, in several cases ending in open revolution is not altogether or rather only a matter of more wages and fewer working hours. It is also a matter of the kind of work which they have to do. When men work with machines they get worked upon by the machines themselves, they begin to lose their humanness and become more mechanical. And if the work is a mere repetition of a previous operation done at speed--as we saw theatrically presented in Charles Chaplin's film Modern Times--the worker's situation psychologically gets worse. The dehumanization of large masses of people creates negative emotions and materialistic thoughts within them. This is not to say that the machine is an evil thing. It has its place, especially where it saves unpleasant, dirty, or fatiguing labour. This is only to say that it should be kept in its place and not allowed to overwhelm the worker inwardly.
-- Notebooks Category 13: Human Experience > Chapter 2: Living in The World > # 146