Do you have to learn a language to speak with yourself? Can you know something but be uncertain about whether you know that thing? Are you responsible for your own happiness (or lack thereof)? And what about the more basic acts of your soul, such as perception or digestion? These are some of the questions addressed by this volume, which brings together contributions in the history of logic, philosophy of mind, and ethics. With papers dealing with both mediaeval and early modern authors, the book highlights long-term historical developments and surprising connections between the three domains. Contributors are Tuomo Aho, Guido Alt, Susan Brower-Toland, Deborah Brown, Tomas Ekenberg, Jari Kaukua, Taneli Kukkonen, Henrik Lagerlund, Vili Lahteenmaki, John Marenbon, Calvin Normore, Martina Reuter, Sonja Schierbaum, Filipe Silva, Juhana Toivanen, and Sara Uckelman.