Did a 14th-century Jewish philosopher anticipate the scientific revolution by dismantling Aristotelian physics?

Ideas & Philosophy · Published 3 October 2026 Swipe more like this →

In short: Hasdai Crescas, a Spanish Jewish thinker, challenged the dominant Aristotelian worldview of his era. By rejecting the impossibility of a vacuum and the limits of space, he proposed an infinite universe. His radical departure from classical rationalism paved the way for later scientific thought and influenced thinkers like Baruch Spinoza.

Hasdai ben Abraham Crescas (1340–1410) emerged from a period of significant upheaval for Spanish Jewry. His magnum opus, Or Adonai (The Light of the Lord), served as a direct assault on the Aristotelian rationalization of religion that had long dominated Jewish philosophy. Crescas argued that traditional physical proofs for God’s existence, largely derived from Aristotelian doctrines, were fundamentally invalid. By attacking these foundations, he sought to shift the focus of Jewish life away from intellectualism and back toward a religion centered on the love of God.

Crescas’s critique was remarkably forward-looking. He rejected the Aristotelian thesis that an actual infinite is impossible, instead positing that space is a three-dimensional, infinite extension. He further argued that the existence of a vacuum and multiple worlds was entirely possible. These ideas, which challenged the rigid structures of medieval Scholasticism, align with the development of anti-Aristotelian physics that began to emerge in the 14th century at institutions like the University of Paris. His work is often viewed as a precursor to the scientific advancements of the 16th century.

Beyond physics, Crescas redefined the relationship between God and humanity. He rejected the Aristotelian notion that the intellect is the supreme state of being, arguing instead that the soul is an independent substance capable of surviving the body. For Crescas, the ultimate human goal is not mere intellectual contemplation but a profound, emotional love for God, whose own attributes are infinite. This emphasis on divine infinity, which mirrors the theology of John Duns Scotus, provided a framework that would later influence the philosophy of Baruch Spinoza, cementing Crescas’s role as a pivotal figure in the history of Western thought.

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