What does reason mean? What is subjectivity? In this concise yet clearly written book, Charles Larmore develops a new approach to two of the most well-known yet challenging fundamental problems of philosophy. Both topics are examined together, as neither reason nor subjectivity, according to the main thesis, can be understood in isolation from each other: Reason is the capacity to be guided by reasons, and such guidance is precisely the type of self-relation that constitutes the essence of subjectivity. The author unfolds this original perspective not only systematically but also historically, referencing relevant thinkers from the past, particularly Kant and Heidegger, as well as those from the present.