  A related objection consists in the complaint that agents can have desires that clearly do not generate any practical reasons because they are for worthless objects. Prominent examples in the literature include a desire to drink a saucer of mud or a can of paint, and a disposition to turn on radios whenever they are off. As noted in section 3.1.3, these examples can’t provide direct counterexamples to any sort of reasons internalism, because reasons internalism itself places only a necessary condition on reasons and not a sufficient condition, and these examples are proposed counterexamples to a sufficient condition. But they are highly relevant to the theoretical argument for internalism that is our concern in this section. If we advance as our case for internalism the explanatory power of the thesis that reasons depend on desire or motivation, then it is a significant problem if this relation isn’t consistent and desire or motivation don’t always generate reasons. Some explanation of this inconsistency is needed, and when we find it we may find that it reveals that something other than desire or motivation is the genuine source of our reasons.