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Thomas Reid and the Scottish school

Contemporary with Hume, but critical of Hume's scepticism, a so-called Scottish school of Common Sense formed, whose basic principle was enunciated by its founder and greatest figure, Thomas Reid:

If there are certain principles, as I think there are, which the constitution of our nature leads us to believe, and which we are under a necessity to take for granted in the common concerns of life, without being able to give a reason for them — these are what we call the principles of common sense; and what is manifestly contrary to them, is what we call absurd.

Thomas Reid was a successor to Francis Hutcheson and Adam Smith as Professor of Moral Philosophy, Glasgow. While Reid's interests lay in the defense of common sense as a type of self-evident knowledge available to individuals, this was also part of a defense of natural law in the style of Grotius. He believed his use of "common sense" encompassed both the communal common sense described by Shaftesbury and Hutcheson, and the perceptive powers described by Aristotelians.

Reid was criticised, partly for his critique of Hume, by Kant and J. S. Mill, who were two of the most important influences in nineteenth century philosophy. He was blamed for over-stating Hume's scepticism of commonly held beliefs, and more importantly for not perceiving the problem with any claim that common sense could ever fulfill Cartesian (or Kantian) demands for absolute knowledge. Reid furthermore emphasized inborn common sense as opposed to only experience and sense perception. In this way his common sense has a similarity to the assertion of a priori knowledge asserted by rationalists like Descartes and Kant, despite Reid's criticism of Descartes concerning his theory of ideas. Hume was critical of Reid on this point.

Despite the criticism, the influence of the Scottish school was notable for example upon American pragmatism, and modern Thomism. The influence has been particularly important concerning the epistemological importance of a sensus communis for any possibility of rational discussion between people.