Hume
Problematic Ideas
The first principle of philosophy is that Universals explain nothing but must themselves be explained.
Deleuze and Guattari – What is Philosophy (p. 7)
This brief quote from the introduction to What is Philosophy? encapsulates an important theme that runs throughout not only Deleuze and Guattari’s collaborative works, but also Deleuze’s own works. This should perhaps be obvious if, as the quote makes clear, it is a first principle of philosophy that Universals do not explain but need to be explained. How are we to explain and account for Universals? Are we to offer a nominalist account, bringing into play the writings of David Lewis, among others, to fine tune the argument? We certainly could, and I do touch upon these types of arguments in An Inquiry into Analytic-Continental Metaphysics (forthcoming), where I compare and contrast Lewis’s and D.M. Armstrong’s approaches to understanding, or explaining, the nature of universals. Rather than rehearse those arguments here, however, I want to return to Deleuze, and in particular to two sources of an explanation of universals that Deleuze draws from–namely, Plato and Hume. These two sources come together, I argue, in the concept of problematic Ideas, and it is here where universals come to be explained; or it is to problematic Ideas that we are to turn in acting upon the first principle of philosophy.
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