This introductory chapter delineates the purpose and content of the edited volume. It reflects on how the potential tension and compatibility between self-interest and the common good have been addressed in the history of philosophy, and it elaborates on the theoretical conditions that must be met in order for a real distinction between these two notions to emerge. The introduction also underscores the advantages of exploring this subject over the transitional period from medieval to early modern philosophy, and suggests ways in which historical views may be useful for contemporary discussions. The chapter concludes by outlining the structure of the book and summarizing the arguments presented in individual chapters.