Over its 10-year history, many pages of "Teaching & Learning Inquiry" have been devoted to explorations that feature introspection. At this moment as the journal's founding co-editors, we look at how introspection manifests itself in many ways in the scholarship of teaching and learning (SoTL). We propose a taxonomy to help us appreciate some of the forms introspection might take and explore some of the benefits and challenges inherent in committing to introspection as a value. Ultimately, we argue that introspection is a pillar of SoTL.