This paper rethinks the fostering task of the teacher in a time when it, paradoxically, has tended to become marginalized and privatized despite its public urgency. Following post-holocaust thinkers such as Hannah Arendt and Zygmunt Bauman, the position explored here is radical in the sense that it takes ‘the crisis of traditions’ and the erosion of a common moral ground or value basis seriously, and it is conservative in the sense that it insists on responding educationally to the call from the past by returning to (a) the moral character of our existence and (b) our own embeddedness in the incompleteness of living traditions. The argument is that there is a difference between educating for common values—which entails a belief in pre-existing commonalities—and making values common in and through education. The latter, we argue, entails an aspiration for continuously creating new commonalities and for cultivating the ability to act and judge as a thinking moral agent in specific, lived and worldly cases. In this sense, the fostering task of the teacher is to create commonality of what is not (yet) common, turning the liberal democratic values of the past into contested objects of study.