In this article I explain the origin of the concept “postsecular”. I argue that such concept, spread by Jürgen Habermas since 2001, has its origin in the reformist Jewish thought from 70’s in the United States. In this context, the postsecular is drafted as a phase which Jewish Theology is experiencing as result of its contact with secular lifestyle. Such contact summons to a reflection on ethic values which secularization missed. I argue that some of the meanings of the current (...) concept of “postsecular”, which Habermas articulates, were already present in the first uses of such concept from Eugene B. Borowitz and Emil Fackenheim. Finally, I argue that it might be set up a correlation between the ethical origins of the postsecular and the Habermas’s as “awareness of what is missing”. (shrink)