Sidgwick developed this position due to his dissatisfaction with an inconsistency in Jeremy Bentham and John Stuart Mill’s utilitarianism, between what he labels “psychological hedonism” and “ethical hedonism”. Psychological hedonism states that everyone always will do what is in their self interest, whereas ethical hedonism states that everyone ought to do what is in the general interest. Sidgwick believed neither Bentham nor Mill had an adequate answer as to how the prescription that someone ought to sacrifice their own interest to the general interest could have any force, given they combined that prescription with the claim that everyone will in fact always pursue their own individual interest. Ethical intuitions, such as those argued for by philosophers such as William Whewell, could, according to Sidgwick, provide the missing force for such normative claims.