Reason

Reason cannot be the ultimate basis of ends- at some point it has to stop. However, reasons are a tool to weigh, cohere and trade-off ends which may be irreconcilable. In doing so, we act with procedural reason- it forms a framework within which our ends are assessed, while simultaneously forming the basis for principles which determine what our ends ought to be. Hence our preferences are transmuted into reasons, in the formation of this framework for action, which is not reducible to utility, although utility may form a basis for reasoned action.

The key is that reason is not definitionally self-interested, but is characterised by an apositional stance, while the application of reason may be motivated by causes outside the framework of reasoned action itself. If ethics is the discussion of reasoned action, then the task of the utilitarian is to justify cause as reason.