The essence of Marxism consists in this, that it approaches society concretely, as a subject for objective research, and analyzes human history as one would a colossal laboratory record. Marxism appraises ideology as a subordinate integral element of the material social structure. Marxism examines the class structure of society as a historically conditioned form of the development of the productive forces; Marxism deduces from the productive forces of society the inter-relations between human society and surrounding nature, and these, in turn are determined at each historical stage by man’s technology, his instruments and weapons, his capacities and methods for struggle with nature. Precisely this objective approach arms Marxism with the insuperable power of historical foresight.
Leon Trotsky, Dialectical Materialism and Science (1925)