The article interprets the not of "common sense" as presented in the works of Thomas Reid. The focus is not primarily on Reid's epistomology or metaphysics or even on the history of the notion or its influence. Rather, the article is strictly concerned with Reid's use of the term. The notion is considered vague by some interpreters and it is confused with the "principles of common sense". The "principles of common sense" play the role of axioms in the model of the human mind that Reid is aiming at, and thanks to that they play the role of criteria since they are the rules of our thinking. We must only distinguish them from widely-shared prejudices. The "principles of common sense" are propositions believed by every healthy adult who understands the propositions in question, considering them without any prejudice. They are integrated into the structures of different languages, they hold up against explicit criticism, and the acceptance of these propositions does not have any absurd consequences. By the term "common sense", on the other hand, Reid understands the faculty of judgment in the area of sensory experience.
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