Abstract
This chapter offers some insight into Spinoza's understanding of the concept of potentia. As is well known amongst scholars, the concept of potentia is fundamental for Spinoza. From ontology, to ethics and politics, the concept of potentia seems to embody the unity of Spinoza's thought. Unlike E1p9, Spinoza focuses on the independence or in the per se nature of the intelligibility of each attribute. The demonstration of the proposition recalls both the definition of the attribute and the definition of substance as explanations. Having more reality, Spinoza states, means having more powers or strength, that is, more potentia to exist. The chapter shows that Spinoza's radical ontology of power emerges in the propositions preparing the consideration of God's necessary existence, namely E1p9–10.