(...) "The struggle regarding the `orthodoxy` of a doctrine, among the `orthodox` theorists, always represents a typical phenomenon of disintegration, repeatedly occurring in the history of thought, whenever a theory is shaken. The unified Marxism was divided into two directions: the `orthodox` and the revolutionary, each of which put forth its own Marxist doctrines - that is, Marxism as a whole - subjected to destructive criticism. (...) Under these circumstances, mysticism and the irrational elements of humanity, expelled by rationalism (...), caused a severe shock, reaching the danger of a complete bankruptcy of the scientific method.

[Excerpt from the text of the preface]