Yet this can be expected only reasonable terms are proposed. The two principles mentioned seem to be a fair agreement on the basis of which those better endowed, or more fortunate in their social position, neither of which we can be said to deserve, could expect the willing cooperation of others when some workable scheme is a necessary condition of the welfare of all. Once we decide to look for a conception of justice that nullifies the accidents of natural endowment and the contingencies of social circumstance as counters in quest for political and economic advantage, we are led to these principles. They express the result of leaving aside those aspects of the social world that seem arbitrary from a moral point of view