Abstract

The history of the relations between Leibniz and Spinoza is a matter of philosophical and scholarly controversy. This chapter aims to refer to the first thesis as the Necessity of Actuality and to the second thesis as the Plenitude of Possibilities. It examines how Leibniz's stance with respect to these two theses, and more generally his views on modality, grew out as a response to Spinoza's views. Leibniz explicitly connects Spinoza's attributes with the concept of a world. As most commentators, Leibniz reads Spinoza as a necessitarian, which is a natural interpretation. The difference between Leibniz's and Spinoza's views would reside in their conceptions of God and of the mechanism whereby the actual world comes to exist. Leibniz entertains the hypothesis of reality encompassing a plurality of actual worlds, which seems to achieve the Plenitude of Possibility.