Marlow: "Emissary of Light"

Before Marlow's journey to Africa, he sees his aunt.  His aunt describes his role on the journey as a "emissary of light."   This means that Marlow, and the rest of the english migrants, are going to be the ray of enlightenment that will bring the savages in Africa to modernity.  However, Marlow disagrees with this statement and states that he simply wishes to travel their for monetary gain.  This act of self-interest is quite the contrary to what his aunt believes, and displays how the english are simply going to exploit the Africans.  The interactions between the english and africans will consequently lead to an integration of the english ways into Africa, but it seems to be a side effect rather than their goal.