History and the Understanding of History

The standard Archimedean moment of Modern Political Philosophy is purportedly a Nowhen, or in Spinoza's case, Eternity.  But, these works are products of abstractions from a transition from the Medieval Era that precedes the writing of them, a period dominated by Theocracy.  In contrast, for Marx, the best polis occurs at a not only specific, but a unique, When, the transition to which is an instance of a general principle of History, i. e. Dialectical Materialism.  Still, what he does not quite explain is the nature of the moment of his coming to understand the essence of that transition, and whether or not the process of coming to that understanding is itself an instance of that general principle, i. e. whether or not it is via Dialectical Materialism that he arrives at that awareness.  This is less of a problem for Hegelian Dialectical Idealism, because the terminal moment of the process is an Idea.