The above passage is taken from a gothic novel âDr. Jekyll and Mr. Hydeâ by Robert Louis Stevenson. This passage develops the theme "Evil can never truly hide itselfâ when Utterson and Enfield are horrified when they see Jekyllâs transformationâ. Jekyll believed that man does not have one side âbut truly twoâ. He asserts that human soul struggling for mastery is a battleground for a âfiendâ and an âangelâ. Therefore, it can be separated by bringing the dark side into being.