The shadow, a psychological concept introduced by Carl Jung, is seen throughout the novella Strange Case of Dr. Jekyll and Mr. Hyde by, Robert Louis Stevenson. It exemplifies everything in us that is unconscious and is the repressed impulses that are generally unacceptable to society. Dr. Jekyll's inability to occasionally indulge in his iniquities led his own shadow to creep up on him and take control. .
The shadow can be explained that "all human beings, as we meet them, are commingled out of good and evil" (39). Upon becoming Mr. Hyde "even as good shone upon the countenance of the one, evil was written broadly and plainly on the face of the other. Evil besides had left on that body an imprint of deformity and decay" (39). As "the shadow" further descended upon Jekyll he found that taking the elixir was no longer necessary at times in order to transform into Hyde, once more illustrating the ill effects of the repressed feelings. Although Jekyll is able to control Hyde's outbursts he gives in after only 2 months, he declares, "I began to be tortured with throes and longings, as of Hyde struggling after freedom; and at last, in an hour of moral weakness, I once again compounded and swallowed the transforming draught" his "devil had long been caged, he came out roaring" (43). This exemplifies the initiative that the longer something is held back and discouraged it appears even stronger then it would when occasionally satiated. .
Dr. Jekyll's societal role was that of "the good doctor." He was expected to lead a flawless life which compelled him to conceal any "sinful" urges that are normally incorporated into ordinary people's lives. His struggle to restrain himself from having an immoral nature began to seize him and he began to acknowledge the impulses, "I knew myself, at the first breath of this new life, to be more wicked, tenfold more wicked, sold a slave to my original evil; and the though in that moment braced and delighted me like wine" (39).