For example, physiologist William B. Carpenter suggested that the strength of one's will depends on “the constancy with which it is exercised” (375). He believed that repeated voluntary behaviors would become a habit over time. In other words, a criminal who repeatedly gives in to his impulses may ultimately be unable to stop them, but he would still be responsible for the behavior in the first place. Jurists have emphasized the importance of self-control, and although self-control can be strengthened or weakened by different life circumstances, each individual is ultimately responsible for keeping his or her desires in check. Robert Louis Stevenson, Ganz points out, was well aware of the debate between jurists and alienists at the time. He studied law at Edinburgh University in 1871, during which time he became very interested in criminal justice. He owned more than twenty-eight volumes of trial reports, as well as several books on crime. His essays and reviews of the 1870s and 1880s were published in journals containing articles by Maudsley and Carpenter. Stevenson's legal background and awareness of the controversy underpin Ganz's thesis: Stevenson uses the strange case of Dr. Jekyll and Mr. Hyde to align his views with jurists and to suggest that broadening the definition of insanity "would blur the distinctions between freedom and compulsion, deviance and illness”