This study of John Dewey's critical exposition of Leibniz's New Essays Concerning the Human Understanding delves into the historical and philosophical dialogue between rationalism and empiricism. Dewey begins with an extensive biographical sketch of Leibniz, tracing how his early access to diverse texts and Leipzig education shaped a lifelong pursuit of unity, comprehensive detail, and systematic thought. The author then positions Leibniz within the intellectual fermentation of the seventeenth century, contrasting his philosophical roots in Aristotle and modern science with the mechanistic materialism of the era.
The core of the work investigates the great debate between Leibniz and John Locke over the existence of innate ideas and the true nature of knowledge. Dewey details Leibniz's counter-arguments, focusing on how the mind operates as an active source of principles rather than a passive tablet. Leibniz rejects Locke's mechanical derivation of all concepts from external sensations, arguing instead for a continuum of perception where unconscious representations gradually rise to distinct rational consciousness.
Further exploration covers Leibniz's theory of will, impulse, and the mechanics of desire. Dewey details how Leibniz avoids determinism while denying arbitrary choice, framing freedom as the progressive realization of reason and harmony with the universe. The book also examines the metaphysical foundations of matter, motion, and space, explaining how Leibniz derives the physical world from spiritual monads through the principle of pre-established harmony.
Finally, the exposition explores the nature and extent of human knowledge, contrasting Locke's view of experience with Leibniz's distinction between contingent truths of fact and necessary truths of reason. Dewey shows how Leibniz seeks to bridge the gap between particulars and universals, arguing that scientific understanding requires uncovering the rational causes behind sensible phenomena. Ultimately, the work presents Leibniz as an intellectual architect who harmonized the ancient heritage of thought with the rising tide of modern scientific discovery.
