Abstract

This chapter examines how Spinoza deals with the identity problem by looking at his account of material and mental things. To understand how material things can remain the same over time, it looks at the “Physical Digression” where Spinoza explains the constitution of bodies. By using the structural criterion, Spinoza can solve a number of problems concerning identity and change. Spinoza would say that there is no identity between the body before and after the accident because the proportion between its moving and non‐moving parts is no longer the same. Memory plays no decisive role, and can therefore be disregarded in the account of diachronic identity. Spinoza goes far beyond the Aristotelian conception by spelling out the form in kinetic terms for material things, and in representational terms for mental things.