  A second argument against ethical egoism was made by H. A. Prichard. He argues that self-interest is the wrong sort of reason.  I do not, for example, think the reason I have a duty to help a drowning child is that helping benefits me (Prichard 2002 1, 9, 26, 29, 30, 122, 123, 171, 188).  Similarly, Prichard chastises Sidgwick for taking seriously the view that there is “a duty...to do those acts which we think will lead to our happiness” (Prichard 2002 135).