This text critically examines Jan Patočka's interpretation of Heidegger, which suggests that man can be explained solely through man himself, without reference to anything external. The author challenges this view, arguing that such a philosophical-anthropological approach is fundamentally reductive. The critique is based on three main pillars. First, it highlights the necessity of understanding man's biological ties to other living beings and the functional interconnectedness of the human body. Second, it emphasizes the importance of social and interpersonal relations, which cannot be viewed merely as products of individual activity. Third, the author posits that man is primarily defined by what he is not yet—by his orientation toward the future, his potential, and his obligations. Understanding human existence requires acknowledging the relationship to the 'not-yet' and the past. Consequently, any attempt to interpret man in isolation from these biological, social, and temporal dimensions is deemed insufficient and overly simplified, as it ignores the essential dimensions that constitute human being.