 It is, I think, quite plain that the meaning of the two words [“expedience” and “duty”] is not the same; for if it were, then it would be a mere tautology to say that it is always our duty to do what will have the best possible consequences. Our theory does not, therefore, do away with the distinction between the meaning of the two words “duty” and “expediency”; it only implies that both will always apply to the same actions. (Ethics: 89)