 A final feature of Rawls’s account of rationality is a normal human tendency he calls “the Aristotelian principle” (TJ sect.65). This “deep psychological fact” says that, other things equal, people normally find activities that call upon the exercise of their developed capacities to be more interesting and preferable to engaging in simpler tasks, and their enjoyment increases the more the capacity is developed and realized and the greater the complexity of activities (TJ, 426/374). Moreover Rawls believes that development of our “higher capacities” (J.S. Mill’s term) is important to our sense of self-respect. These general facts imply that rational people should incorporate into their life plans activities that call upon the exercise and development of their talents and skills and distinctly human capacities (TJ 432/379). This motivation is especially relevant to Rawls’s argument for the stability of justice as fairness and the good of justice (see below, §5.3). The important point here is that the Aristotelian principle is taken into account by the parties in their decision on principles of justice. They want to choose principles that maintain their self-respect and enable them to freely develop their human capacities and pursue a wide range of activities, as well as engage their capacities for a sense of justice. 