With every day, and from both sides of my intelligence, the moral and the intellectual, I thus drew steadily nearer to that truth, by whose partial discovery I have been doomed to such a dreadful shipwreck: that man is not truly one, but truly two. I say two, because the state of my own knowledge does not pass beyond that point. Others will follow, others will outstrip me on the same lines; and I hazard the guess that man will be ultimately known for a mere polity of multifarious, incongruous and independent denizens. I for my part, from the nature of my life, advanced infallibly in one direction and in one direction only.
Strange Case of Dr Jekyll and Mr Hyde is a Gothic novella by Scottish author Robert Louis Stevenson, first published in 1886. The work is also known as The Strange Case of Jekyll Hyde, Dr Jekyll and Mr Hyde, or simply Jekyll and Hyde. It is about a London legal practitioner named Gabriel John Utterson who investigates strange occurrences between his old friend, Dr Henry Jekyll, and the evil Edward Hyde. The novella’s impact is such that it has become a part of the language, with the vernacular phrase “Jekyll and Hyde” referring to persons with an unpredictably dual nature: outwardly good, but sometimes shockingly evil.