The above passage is taken from a gothic novel ‘Dr. Jekyll and Mr. Hyde” by Robert Louis Stevenson. This passage develops the theme "Evil can never truly hide itself” when Utterson and Enfield are horrified when they see Jekyll’s transformation”. Jekyll believed that man does not have one side ‘but truly two’. He asserts that human soul struggling for mastery is a battleground for a “fiend” and an “angel”. Therefore, it can be separated by bringing the dark side into being.