 Essential to being reasonable is having a sense of justice. The sense of justice is a normally effective desire to comply with duties and obligations required by justice; it includes a willingness to cooperate with others on terms that are fair and that reasonable persons can accept and endorse. Rawls sees a sense of justice as an attribute people normally have; it “would appear to be a condition for human sociability” (TJ, 495/433 rev.). He rejects the idea that people are motivated only by self-interest in all that they do; he also rejects the Hobbesian assumption that a willingness to do justice must be grounded in self-interest. It is essential to Rawls’s argument for the feasibility and stability of justice as fairness that the parties upon entering society have an effective sense of justice, and that, as members of society, they are capable of doing what justice requires of them, either for its own sake, or because the believe this is what morality requires of them. An amoralist, Rawls believes, is largely a philosophical construct; the amoralists who actually exist Rawls sees as sociopaths.