 First, it could be argued that, when it comes to introspection, there is no difference between appearance and reality; therefore, introspective seemings infallibly constitute their own success. Alternatively, one could view introspection as a source of certainty. Here the idea is that an introspective experience of p eliminates any possible reason for doubt as to whether p is true. Finally, one could attempt to explain the specialness of introspection by examining the way we respond to first-person reports: typically, we attribute a special authority to such reports. According to this approach, introspection is incorrigible: its deliverances cannot be corrected by any other source.