Philosophy is the activity of self-conscious thinking reflecting on its own exercise and possibilities. In this course, we read a number of texts that require their readers to engage in this self-conscious exercise of the capacities for thinking and so potentially change their relation to their own thinking. In particular, we will pay particular attention to the forms of knowing and of skepticism each text articulates. In so doing, we will investigate several forms of philosophical criticism, analyzing each text as a distinct response to questions such as: How do we know? What criteria do we have for knowing that we know?