There’s a reason to be skeptical that such a reason could be  provided.  A reason to be instrumentally coherent as such would have to  apply at once to beliefs and intentions.  But one might think that this  cannot be the case: that reasons for belief and reasons for intention  are fundamentally different in kind.  Reasons for belief are  considerations that show that the belief is likely to be true, whereas  reasons for action are considerations that show that the action would  realize one’s desires, or promote or respect something of value.