 Augustine’s primary response to the external-world skeptic is Augustine’s claim that things “seem” to him, and that these seemings constitute the world. He supports this view by arguing that seemings are required in order for error to occur—otherwise, what would we be mistaken about? And since the possibility of error is the main impetus for skeptical doubt, skepticism requires the admission that things seem. In other words, for Augustine, one cannot doubt that one has mental content, even if one might have doubt about whether this content corresponds to anything external to the mind.