When Marlow talks of London once being a dark place, the theme of civilization versus savagery comes into play. The book implies that civilizations are created by the setting of laws and codes that encourage men to achieve higher standards. London itself is seen as a symbol of enlightenment. We see this through Marlow and how he tells his crew that the Romans had brought a light into the darkness of Britain. Marlow and Kurtz are two antithetical examples of humanity. Kurtz represents what every man will become if left to his own desires, without a
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protective, civilized society. Marlow represents the civilized soul that has not been drawn back into savagery by his "heart of darkness". The book