From Leon Trotsky (1879-1940), Results and Prospects (1906), VII. The Pre-Requisites of Socialism:
http://www.marxists.org/archive/trotsky/1931/tpr/rp07.htm
“Undoubtedly, the concentration of production, the development of technique and the growth of consciousness among the masses are essential pre-requisites for socialism. But these processes take place simultaneously, and not only give an impetus to each other, but also retard and limit each other. Each of these processes at a higher level demands a certain development of another process at a lower level.
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