 (See D.D. Raphael (ed.) 1991 The British Moralists [henceforward BM: §489].) Russell appears to have thought that a theory that left “good” and “ought” undefined would not meet this constraint. But if “good” means what procures satisfaction, then we have the beginnings of such an explanation. For we usually desire that our desires be satisfied, and hence we have a reason to pursue and promote the good.