 GC makes sense of the intuition in some cases of self-doubt that the subject should drop her confidence. The pilot on looking at the altimeter reading should cease to be so sure she has enough gas for fifty more miles because it gives her reason to think she is in a state where her calculations will not reliably turn out truths. Similarly, the doctor realizing she is severely underslept acquires reason to think she is in a state where her way of coming to beliefs does not reliably lead to true conclusions. The main dissatisfaction with GC has been that it apparently cedes all authority to second-order evidence. In fact in GC’s formulation the confidence you should finally have in q does not depend on how far the evidence e supports q or how far you think e supports q, but only on what you think is your propensity for or frequency of getting it right about q, whether you used evidence or not.