These suggestive echoes comprise Conrad's famed evocation of the African atmosphere in Heart of Darkness . In the final consideration his method amounts to no more than a steady, ponderous, fake-ritualistic repetition of two antithetical sentences, one about silence and the other about frenzy. We can inspect samples of this on pages 36 and 37 of the present edition: a) it was the stillness of an implacable force brooding over an inscrutable intention and b) The steamer toiled along slowly on the edge of a black and incomprehensible frenzy. Of course there is a judicious change of adjective from time to time, so that instead of inscrutable, for example, you might have unspeakable, even plain mysterious, etc., etc.