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Leibniz's New Essays Concerning the Human Understanding: A Critical Exposition

John Dewey · philosophical monograph, 1888·6 hrs in the original·original at gutenberg.org
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  • Monads and pre-established harmony: Leibniz's universe consists of infinitely many spiritual, self-active 'monads,' each of which mirrors the entire universe from its own point of view, with their perfect coordination explained not by direct causal interaction but by a pre-established harmony grounded in God.
  • Innate ideas against Locke: Where Locke treats the mind as a blank tablet filled by sensation, Leibniz argues that intelligence has an inherent structure whose necessary activities, such as the concepts of substance, unity, and identity, are 'innate' not as ready-made impressions but as the organic framework through which all experience is constituted.
  • Matter, sensation, and knowledge: Matter is not a separate substance but the passive, confused side of monadic activity; sensation is undeveloped spiritual representation; and genuine scientific knowledge consists in progressively clarifying these confused perceptions through the principles of sufficient reason and continuity until their rational necessity is revealed.
  • Leibniz's fundamental contradiction: Dewey argues that Leibniz's deepest failure is the conflict between his scholastic method, which treats formal identity and non-contradiction as the sole criterion of necessary truth, and his substantive vision of reality as an organic, dynamic unity of differences, a tension that forces him to oscillate between implicit Spinozistic monism and a lawless atomism of isolated monads.
  • Leibniz as Kant's true predecessor: Dewey concludes that Kant's analytic-synthetic distinction, his treatment of the sensuous and supersensuous, and his doctrine of the harmony of nature and freedom are all transformations of Leibnizian ideas, so that the Critique of Pure Reason is best understood as the methodologically rigorous apology for what Leibniz had grasped but could not adequately demonstrate.
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•Why it earns a slot

Written by the young Dewey before his pragmatist turn, this 1888 study is a rare English-language reconstruction of Leibniz's scattered writings into a coherent system, notable for its early argument that Kant's critical philosophy is unintelligible without Leibniz as its direct source.

Dewey systematically expounds Leibniz's philosophy by working through the 'Nouveaux Essais,' Leibniz's point-by-point response to Locke's Essay on Human Understanding. He reconstructs Leibniz's core doctrines, including the monad, pre-established harmony, innate ideas, matter, space, and God, showing how they form a unified idealist alternative to British empiricism. The book closes with a critical chapter identifying a fundamental contradiction in Leibniz between his scholastic formal-logical method and his organic, dynamic conception of reality, then traces how Kant inherited and partially resolved that tension.

This distillation is written from the freely available original, which is always the better read when you have the time: gutenberg.org.

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