"In Capital, Marx has a marvellous chapter [Ed. note--Ch. XI] which I want to translate into the simplest language that even the semi-literate can understand, the chapter on co-operation, where he writes that the collective gives birth to a new force. It is not just the sum-total of people, the sum-total of their forces, but a completely new, much more powerful, force. In his chapter on co-operation Marx writes about the new material force. But when, on its basis, unity of consciousness and will springs up, it becomes an indomitable force...."
January 1, 1970
https://en.wikiquote.org/wiki/Karl_Marx