Desperately trying to live up to his Superego's morality, Dr. Jekyll constantly tries to inhibit the desires of his Id, thus, fabricating an unbalanced personality. "Dr. Jekyll asserts that a "man is not truly one, but truly two," and he imagines the human soul as the battleground for an "angel" and a "fiend," each struggling for mastery" ("Themes and Topics"). His potion, which he hoped would separate and purify each element, succeeds only in bringing the dark side into being - Hyde emerges, but he has no angelic counterpart. The Id dominates Mr. Hyde merely because it has been inhibited for a very long time. Perhaps Dr. Jekyll is simply mistaken: man is not "truly two" but is first and foremost the primitive creature embodied in Hyde, brought under tentative control by civilization, law, and conscience. According to this theory, the potion simply strips away the civilized coating, exposing mans essential nature. Both Id and Superego get used to being in total control, when they take over Mr. Hyde and Dr. Jekyll, respectively. Once in possession, they refuse to let the Ego function as a mediator, causing one to have a highly unbalanced, thus, dual personality. .
Hence it came about that I concealed my pleasure; and that when I reached years of reflection, and began to look round me and take stock of my progress and position in the world, I stood already committed to a profound duplicity of life. Many as I was guilty of; but from the high views that I had set before me, I regarded and hid them with an almost morbid sense of shame. (Stevenson 103).
These desirable, immoral wants result in the emergence of Dr. Jekyll's other side,.
that of Id- dominated Mr. Hyde. This transition is possible due to Dr. Jekyll's invention and science. In the novel, Stevenson suggests that the man who sets himself above moral restriction becomes evil and subhuman. Freedom itself, however, is irresistible and tempting.