Leibniz's New Essays Concerning the Human Understanding

John Dewey's study of Leibniz's New Essays presents a rich, fragmentary masterpiece of modern philosophy and aims to clarify Leibniz's own thought for readers without flattening its complexity. The book opens with Leibniz as a child of the scientific revolution and Cartesian rationalism, deeply engaged with Locke on innate ideas, sensation, and the mind-body relation, and then broadens into a portrait of a prodigiously industrious life shaped by family influences, self-directed study, and an early hunger for unity, order, and tolerant inquiry. From Leipzig to Paris and Hanover, Leibniz emerges as a polymath whose legal, diplomatic, mathematical, and historical labors all feed a single vision of interconnected knowledge. Dewey traces the major doctrines of Leibniz's philosophy: pre-established harmony, monads, the relation of the universal to the individual, freedom and moral action, matter, motion, space, time, and the reality of phenomena. He shows Leibniz rejecting a purely mechanical nature in favor of a spiritually ordered universe grounded in intelligible law, where freedom grows with reason and culminates in God's perfect unity of understanding and will.