 To see why the IBE approach might not go far enough, consider the idea that experiences provide non-inferential justification for beliefs about the external world. If experiences provide non-inferential justification for beliefs about the external world, they justify beliefs through a route that does not involve further beliefs. Compare how your sharp pain might justify you directly in believing that you are in pain, without further beliefs playing any role. Contrast how your thermometer might justify you in believing you have a fever only in conjunction with your having reason to believe the thermometer works. Non-inferential justification is justification that does not involve auxiliary beliefs (see Pryor 2005 for more detail).