ItWillNeverWork
Messy Crimbobs, fellow humans.
Two quotes that I used in an essay for a Soviet history class I took last year, and that seem relevant for contrasting Marx with Marxists in regards to determinism:
"Marxism [...] is an integral world outlook, a philosophical system, from which Marx’s proletarian socialism logically follows. […] It is self-evident that the socialist system will follow capitalism as inevitably as day follows night..”
(Stalin, J.V., 1954, Anarchism or Socialism?, Moscow: Foreign Languages Publishing House, Works, Vol. 1, November 1901 - April 1907, accessed at marxists.org/reference/archive/stalin/works/1906/12/x01.htm
“It is not history which uses men as a means of achieving - as if it were an individual person - its own ends. History is nothing but the activity of men in pursuit of their ends.”
(Marx, K, 1845, The Holy Family or Critique of Critical Criticism. Against Bruno Bauer and Company, MECW Volume 4, Moscow: Progress Publishers, 1975, accessed at http://www.marxists.org/archive/marx/works/1845/holy-family/ch06_2.htm)