Michael Della Rocca Quotes

How many things are there in the world? Spinoza’s answer: one.

According to Spinoza’s system, all reality flows with strict necessity from the nature of God. With the geometrical method, Spinoza captures the structure of this reality by deducing philosophical conclusions about reality from definitions which express the nature of God.

Spinoza can be seen as a pure philosopher, always seeking explanation, always refusing to be satisfied with primitive, inexplicable notions. This purity is most evident in his commitment to the principle that each fact has an explanation, that for each thing that exists there is an explanation that suffices for one to see why that thing exists. Although Spinoza does not himself use the term, this principle is known as the Principle of Sufficient Reason (PSR).

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.

The purity of Spinoza’s commitment to explanation can best be articulated in terms of his commitments to the Principle of Sufficient Reason (hereafter, the “PSR”) and to his naturalism.

Rethinking Spinoza in light of the Principle of Sufficient Reason promises to be important not only for our understanding of Spinoza, but also for our understanding of the philosophical issues Spinoza deals with and that continue to trouble philosophers today.