Thomas Reid's Theory of Common Sense is a philosophical theory developed by Scottish philosopher Thomas Reid in the 18th century. It is a theory of knowledge that emphasizes the importance of common sense in understanding the world. Reid argued that common sense is a reliable source of knowledge and
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Thomas Reid was a religiously trained Scottish philosopher best known for his philosophical method, his theory of perception, and its wide implications on epistemology, and as the developer and defender of an agent-causal theory of free will. He also focused extensively on ethics, theory of action, language and philosophy of mind.