Regarding how moral principles are derived from the contractualist formulation, when considering whether a principle can be rejected we must take into account the consequences, in general, of its being accepted, not only the consequences of the particular actions that it allows. Because we cannot be sure about who will be affected by a principle, and how they will be affected, we must draw on our experience of life and consider the "generic reasons" which individuals are likely to have, as a result of their general circumstances, to reject a principle. In order to determine whether a principle is reasonably rejectable, we must impartially weigh these generic reasons against each other, and exercising our judgement, draw a conclusion about what the weight of reasons support. Given the motivation of finding principles for the general regulation of society that no-one could reasonably reject, if the weight of reasons support a certain conclusion then it would be unreasonable to reject that conclusion. Importantly, principles can only be rejected by individuals; aggregation of reasons across individuals is not allowed. So if the generic reasons of an individual carry more weight than any other individual's generic reasons, then his generic reasons are (for the most part) decisive in determining principles.