What is the task of educational theory or philosophy if it is not merely conceived as specification of philosophical doctrines in the realm of education? In my view it is the particular task of educational-philosophical theory to "work critically" on the historically developed cultural constructs that shape our (educational) experience. Thus, the activity that educational theorists are to perform is the critical reflection of the "limits of our world" by drawing on philosophical references and theories. In this text I describe this activity drawing from my own research practice with a particular focus on its relation to what is called thinking.