 Rawlsian citizens are not only free and equal, they are also reasonable and rational. The idea that citizens are reasonable is familiar from political liberalism. Reasonable citizens have the capacity to abide by fair terms of cooperation, even at the expense of their own interests, provided that others are also willing to do so. In justice as fairness, Rawls calls this reasonableness the capacity for a sense of justice. Citizens are also rational: they have the capacity to pursue and revise their own view of what is valuable in human life. Rawls calls this the capacity for a conception of the good. Together these capacities are called the two moral powers.