The present paper makes the case for considering Jean Hering the source from which Edith Stein first borrowed the concept of "core," notably, "core of the person." In particular, we maintain that the background of Stein's decision is represented by the original version of Hering's famous booklet Bemerkungen über das Wesen, die Wesenheit und die Idee, namely, the Appendix (Fragmente zur Vorbereitung einer künftigen Lehre vom Apriori) to his still unpublished dissertation on Lotze. Nevertheless, whereas Hering introduces the concept of "core" to merely discriminate between different types of essences within the framework of a general attempt at determining the structure of individual essences, Stein takes it to characterize always and exclusively the structure of the person, notably, its mode of being, thereby paving the way for her future personalistic ontology.
The paper will be divided into three parts. In §2 evidence will be produced to support the thesis that Stein had direct knowledge of Hering's dissertation. §3 will analyze Hering's notions of essence and "core of the essence" (in both versions of the text and in relation to the example of the "essence" of Caesar).
Finally, §4 will tackle the "core" in Stein's early works, in particular in the book on empathy, and in comparison with Hering's understanding of it. The paper intends to pursue a double goal: it aims at emphasizing the novelty of Stein's conception of the essence, notably, core of the (individual) essence while at the same time reconstructing the wider framework to which it belongs.