American philosopher
Michael Della Rocca (born 1962) is an American philosopher and historian, specialized in the history of modern philosophy, metaphysics and philosophy of mind.
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Spinoza’s metaphysics is, in many ways, an effort to tap into the underlying rationalist motivations of Descartes’s metaphysics and to follow through on these motivations more consistently than Descartes ever did. Employing the Cartesian notions of substance, attribute, and mode, and wielding strongly rationalist principles only hinted at in Descartes—such as the PSR and the Principle of the Identity of Indiscernibles—Spinoza is able to mount a powerful argument for substance monism, for the view that there is, fundamentally, only one thing in the world.
For Spinoza, obviously, the human mind, as well as the human body, are individuals (actually, they are the same individual). However, this individuality of the human mind would be threatened if the human mind were made up of ideas whose contents were relatively disparate, if these ideas were not all focused around a particular unified thing, such as the human body.
Spinoza’s own view is one according to which human beings and the rest of reality are not explained in such different ways, according to which human beings and all else operate according to the same laws. Such a unification of explanatory principles is the heart of Spinoza’s naturalism about psychology: human psychology is governed by the same fundamental principles that govern rocks and tables and dogs. Thus no new principles are needed to explain human psychology beyond those principles needed to explain the rest of nature anyway. More generally, Spinoza’s naturalism, as I understand it, is the view that there are no illegitimate bifurcations in reality.