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Descartes, Spinoza, and Leibniz

Parallel Philosophy · Volume I · Chapter 28

AvailableSupplied bilingual philosophy chapter
Record ID
philosophy-28
Updated
13 September 2026

Research record

In seventeenth-century Europe, the question of the basis of certain knowledge intensified amid science and mathematics, crusades and political changes, and the transformation of the institutions of knowledge. Descartes, Spinoza and Leibniz are often referred to as the intellectuals. This classification is useful for study, but the ideas of the three philosophers are not identical. Descartes seeks a faith that can withstand the severest test of doubt. The senses are confused. dream experiences can explain the waking experience. so they gradually doubt their beliefs. But one thing that cannot be denied when doubting is the contemplative existence of the doubter. This is where the famous conclusion of the cogito comes in. The purpose of this doubt is to find a definite basis, not a permanent doubt. Parallel philosophy accepts Descartes ' skepticism as a disciplined method, but does not regard universal skepticism as the norm of everyday knowledge. The Nyaya tradition examines the specific causes of suspicion, while Descartes systematically raises broader doubts. Comparison is useful and should not be confused with equality. Descartes distinguishes between the mind as the deliberative element and the body as the expansive element. This division leads to new questions of consciousness, identity and the body. But then the difficulty arises as to how these different elements form a causal relationship with each other. Many of the questions of modern philosophy of mind are connected to this Cartesian heritage. Spinoza replaces the dualism of Descartes with a monism. Ishvara or Prakriti is understood to be two names for the same infinite essence. Mind and body are not two independent entities but different qualitative expressions of the same reality. In the philosophy of Spinoza, freedom is not an arbitrary will. I am part of the cause-order. Real freedom lies in understanding needs, breaking free from emotional bondage and developing intellectual life. In this view, ethics links back to a cosmological understanding. The importance of ethics lies not only in metaphysics; Spinoza understands fear, hope, jealousy, love, hatred and desire causally. Rather than dismissing emotions as mere moral quandaries, one must understand their origins. A direct analogy with modern psychology is not appropriate, but the causal analysis of emotional life is philosophically remarkable. Leibniz asks why there is a zero. According to the doctrine of sufficient reason, a fact or truth must have a just cause. Simultaneously, he develops the theory of contradiction, the concept of possible worlds, monads, and preconceived notions of harmony. The concept of the possible world has a broad influence in modern modal philosophy, although modern usage may differ from Leibniz 's original metaphysics. Leibniz 's monads are simple, indivisible elements that reflect the world in their own way. Different perspectives can give different presentations of the same world. Parallel philosophy may here take metaphysical inspiration from polytheism, but does not declare its theories to be the direct historical successors of Leibniz. Descartes, Spinoza, and Leibniz all held high ideals of mathematical clarity and logic and theory. But without sufficient connection to experience, reason can cut off the self from the world. For this reason, later empiricist traditions question where the content of thought comes from. The textual division of the intellectual versus empiricist text is an early map of philosophical history, not the terrain itself. Descartes talks about experience. using Locke 's logic. Leibniz does not deny experience. Parallel philosophy studies each thinker in the complexity of their reasoning. Descartes 's skepticism is a method of finding a definitive basis for not permanently abandoning all belief systems in life. The senses sometimes give off illusions; dream experiences seem to awaken - and systematic deception in thought may be considered possible. But nothing is certain: the findings themselves are an act of skepticism.

Structured debate

Pūrvapakṣa

The pursuit of a certain knowledge is an impossible ideal

Uttarapakṣa

Absolute infallibility is not possible, but clarity and the ideal of cross-examination are valuable. The problem lies in making infallibility a necessary condition of knowledge. Parallel philosophy tends to favor error correction knowledge.

Parallel conclusion

From Descartes ' discipline of skepticism to Spinoza 's unity of reality and causal understanding, Leibniz brings out the seriousness of sufficient reason and probability. All three together form the major questions of modern European metaphysics and epistemology, but it is not appropriate to confine them to a single intellectual room.

Section index

  1. 28.1 The methodological doubts of Descartes
  2. 28.2 The Duality of the Mind
  3. 28.3 Spinoza: One element is a number of properties
  4. 28.4 Emotions and freedom
  5. 28.5 Leibnitz: Reason enough
  6. 28.6 The Monad and the Multitude
  7. 28.7 The Limits of Rationalism
  8. Caution of the 28.8 Classification
  9. 28.9 Limitation of reasonable doubt
  10. 28.10 The Interaction of the Mind-Body
  11. 28.11 The Monotheism of Spinoza
  12. 28.12 Necessity and Freedom and Emotion
  13. 28.13 A sufficient reason for Leibnitz to

Scholarly apparatus

Evidence status: Supplied bilingual philosophy chapter.

Source / provenance: Gajendra Thakur’s Parallel Philosophy, Volume I · supplied bilingual Chapter 28

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Gajendra Thakur. “Descartes, Spinoza, and Leibniz.” Videha Digital Research Archive: Mithila–Vajji–Anga. Videha — https://www.videha.co.in/ · ISSN 2229-547X · GitHub mirror: https://videha-ejournal.github.io/videha/ · Digital Research Archives on GitHub: https://github.com/videha-ejournal. https://videha-ejournal.github.io/mithila-vajji-anga/records/idea/philosophy-28/

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