 On either reading, however, it appears that Locke is saddled with the view that in cases of simple ideas, ideas of modes and mixed modes, if we understand the meanings of the words, we know all that there is to know regarding those concepts. Moral and mathematical concepts and ideas are mere trifling propositions, analytic truths and uninformative. However, it will be difficult for many moral philosophers to accept that all they are doing is cashing out the definitions of terms and dealing with uninformative analytic truths; asserting that lying is wrong seems to be more than a trifling opinion. Moreover, it is unclear how Locke thinks moral terms can be normative, i.e., how they can constitute commands we ought to obey—if his position is correct.