How does rationalism differ from empiricism?

In Western philosophy, the debate between rationalism and empiricism centers on the origin and justification of human knowledge.12

Core Differences

• Source of Knowledge: Rationalism posits that reason or the intellect is the fundamental source and test of knowledge. Rationalists argue that reality possesses an inherently logical structure that the mind can grasp directly. Conversely, empiricism maintains that all concepts and knowledge originate in, and must be tested by, sense experience.132
• A Priori Truths: Rationalists assert that there are significant truths—particularly in logic, mathematics, and metaphysics—that are accessible to the intellect independently of sense perception. Empiricists generally deny that human beings can possess significant knowledge prior to experience, often viewing the mind as a tabula rasa (blank slate) that records sensory impressions.32
• The Role of the Mind: Rationalism suggests an isomorphism between reason and reality, allowing the mind to apprehend the world as it is. Empiricism often views the mind as more passive, focusing on how simple ideas derived from sensation are combined into complex concepts.2

While these schools of thought were historically presented as rivals, philosophers like Immanuel Kant later sought to resolve the controversy by arguing that while knowledge begins with experience, it is structured by the mind's own a priori categories.14