Heidegger's lecture delivered to the Marburg Theological Society in July 1924 is designed to be introductory in nature and develops the problem of the concept of time by setting it over and against the everyday concept of 'natural' time and time 'in the world'. Phenomenological analysis of the nature of time points up a more fundamental dimension of temporalness ("Zeitlichkeit") and its relation to "Dasein". In indicating some of the basic structures of "Dasein", Heidegger reveals temporalness ("Zeitlichkeit") to be the fundamental statement of Human Being ("Dasein") with regard to its own Being ("Sein").