The language of constitutional government, scientific inquiry, freedom of conscience, religious toleration, and universal rights owes much to eighteenth-century philosophy. More than any other intellectual movement of the modern era, the Enlightenment claimed that reason could discover principles valid not merely for particular nations or religions but for humanity itself. Universalism became one of its defining aspirations. It has also become one of its greatest controversie

This article examines the pivotal role of Roger Bacon in the transformation of Western epistemology from medieval scholasticism to the foundations of modern scientific and mechanistic thought. It argues that Bacon’s elevation of experiment and mathematics as epistemic authorities initiated a structural division between reason and experience that later emerged philosophically as the distinction between a priori and a posteriori knowledge in Kant. The study explains Aristotle’s