In this article, Hegel's critique of Spinoza's ontology of substance is investigated. The main point of Hegel is that the problem of this kind of ontology consists in the conception of the substance merely as a substanace and not at same time as a subject.
The important step to the concept of the substance as a subject was made firstly by Leibniz with his notion of monade and then by Kant with his notion of the original unity of the apperception.