Shpet holds that philosophy proceeds through three stages (and as in Hegel's Phenomenology whether these are purely logical or chronological as well is arguable): from wisdom then on to metaphysics before finally arriving at rigorous science or knowledge. Unlike positivistic "scientific philosophy," which seeks to copy the methodology of an arbitrarily chosen natural science or bases itself on results attained in natural science, philosophy as pure knowledge grounds the specific sciences.
Shpet's philosophical development can be broken into at least three periods. Although one contemporary scholar (A. Haardt) holds the first of these to range from 1898-1905, no writings have emerged from these very youthful years and certainly Shpet published nothing at this time. What little information we have comes from an autobiographical remark in his huge 1916 thesis. Thus, seeing his Marxist infatuation as a stage in Shpet's thought serves no useful purpose.