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Why does Deleuze rely so heavily on Spinoza and Leibniz? At first glance, his critique of representation and the traditional ‘image of thought’ seems to oppose him to rationalism. However, Deleuze says that when the ‘cry of rationalism’ is pursued until the end, rationalism becomes ‘delirious’. In such a state, it undermines the model of representation. This delirium is found in Spinoza and Leibniz's critique of generality and their conflation of essence and existence, through which they ruin the traditional mediation of difference by identity and generality. However, for this rationalism to completely break with representationalism it must undergo some Deleuzian corrections.

Salomon Maïmon argues that the formal determination of experience in Kant’s first Kritik insufficiently answers the question ‘quid juris?’. As an alternative to Kant’s theory, he develops a genetic transcendentalism in which experience is completely determined a priori. Discussing this genetic approach, I focus on how the spatiotemporal determinations of conscious experience are traced back to pure ideal relations. Relying on Leibniz and his theory of space and time, I explain how the extensive magnitudes of consciousness are founded in intensive magnitudes of what Maïmon calls ‘pure thought’. As the latter is the transcendental ground for both sensibility and the understanding, Maïmon’s theory contains a radical form of immanence, much like the philosophy of Spinoza and Gilles Deleuze.

In What Is Philosophy? Deleuze and Guattari understand concepts in a very unconventional way. One of the central aspects of their theory is that concepts are self-referential and should not be understood in terms of any form of reference or representation. Instead, concepts are complex “assemblages” interacting on a “plane of immanence.” I argue that we can best understand this theory through the philosophy of Spinoza. The latter understands thought and ideas through the model of physical bodies. Spinoza’s theory of thought is, as François Zourabichvili says, a “physics of thought.” I do not only call upon Spinoza to elucidate the general approach of Deleuze and Guattari; I also use Spinoza’s notions of modal essence and existence, interpreted by Deleuze in terms of intensity and extensity, to expound the details of their distinction between concepts and propositions.

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