 Rather, a theory can be said to be true when, in any given historical situation, it expresses the real developmental trend of that situation.For the majority of Marxists, truth was truth no matter when and where it was known, and scientific knowledge (which included Marxism) accumulated historically as the advance of truth in this everyday sense.In this view, Marxism (or the Marxist theory of history and economics) did not belong to the illusory realm of the superstructure because it is a science.