Simple Explanation of the Main Idea
The quote talks about workers in factories who work a lot and stay crowded together.
They are like soldiers who must follow orders and stay quiet, with little choice.
They become very tired because the machines and the factory control how they live and work.
Because of this, the workers do not get richer as factories grow; they become poorer.
In short, the main idea is that progress in industry can hurt workers, making them workers, not free people.
The quote shows a warning: machines and big factories can take away workers' chances for a better life.