Abstract
This essay supports a so-called identification-oriented interpretation of the argument for substance monism. It emphasizes the conceptual barrier between different attributes and the conceptual-independence condition in the definition of substance. It argues that certain features of Spinoza’s notion of attributes enable him to defend his argument for substance monism from a number of challenges: the fact that, for Spinoza, each attribute of a substance, independently of the modes of the substance and independently of other attributes, is sufficient for conceiving of the substance; and the fact that, for Spinoza, because of the conceptual independence of the attributes, no attribute of a substance can prevent that substance from having any other attribute.