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Lampl-de Groot discusses the doubts most psychoanalysts feel about the theory of life and death instincts. Similar constructive (unifying) and destructive (dissolving) forces exist in the inanimate universe, in biology, and in mental life. The term 'drive' should be reserved for psychological phenomena, 'force' or 'tendency' for somatic phenomena. Freud's theory of life and death instincts is no more mystical than are other hypotheses in other sciences.