 There are, of course, reasons to be worried about both of these ways of knowing basic goods — worries that go beyond general skeptical doubts about how we could know any normative truths at all.  Derivationists have to explain how we come to know what counts as an actualization of a human potency, and have to explain how we connect these via bridge principles with human goods. Inclinationists have their own troubles. In particular, they need to deal with the fact that, even if they are not in the business of deriving goods from inclinations or identifying the goods precisely with what we tend to pursue, they take as their starting point human directedness.   And it has been rightly noted that human directedness is not always a lovely thing. Power and prestige seem to be a matter of human directedness — at least as much so as, say,  aesthetic enjoyment and speculative knowledge — but they do not make it to the natural law theorist’s catalog of goods (though they do appear to be part of the good in Aristotle’s picture; cf. the discussion in Hare 2001, p. 14). While these difficulties persist for inclinationist and derivationist accounts of knowledge of the basic goods, they may well be eased if one affirms both accounts: one might be able to use inclinationist knowledge to provide some basis for bridge principles between knowledge of human nature and knowledge of human goods, and one might be able to use derivationist knowledge to modify, in a non-ad-hoc way, the objectionable elements of the account that one might be bound to give if proceeding on an inclinationist basis alone. (Reconciling the inclinationist and derivationist approaches is a theme in Murphy 2001 and Wall 2010.)