Chapter 3 50 Abstract Tolerance is an important educational goal in diverse societies; however, tolerance is also a complex concept. This article clarifies theoretically what the aim of fostering tolerance could mean for teachers in strong religious schools who may experience specific ideological and didactical tensions in promoting religious tolerance. These potential tensions are explored theoretically by examining what the educational goal might mean and by investigating theories about teachers’ professional ideals and their belief systems. In this way, the importance of teachers’ reflection on their professional beliefs is shown. The article’s background is defined by Dutch educational legislation and orthodox Protestant primary schools.