Thomas Reid
Thomas Reid (1710–1796) was a Scottish philosopher and religious minister who founded the Scottish School of Common Sense. He is best known for his philosophical method, his theory of perception, and his defense of an agent-causal theory of free will, with significant contributions to epistemology, ethics, theory of action, language, and philosophy of mind. A contemporary and fierce critic of David Hume, Reid was a joint founder of the Royal Society of Edinburgh in 1783 and played a key role in the Scottish Enlightenment.
Born in the manse at Strachan, Aberdeenshire, to Lewis Reid and Margaret Gregory, he was educated locally and earned an M.A. from Marischal College in 1726. Licensed to preach by the Church of Scotland in 1731, he began his career as a minister. In 1752, he left the ministry to become a professor at King’s College, Aberdeen. In 1758, he co-founded the Aberdeen Philosophical Society, known as the ‘Wise Club’. He received an honorary D.D. from Marischal College in 1762 and published his first book, *An Inquiry Into the Human Mind on the Principles of Common Sense*, in 1764. Shortly after, he replaced Adam Smith as Professor of Moral Philosophy at the University of Glasgow, resigning in 1781 to prepare his lectures for publication. These became *Essays on the Intellectual Powers of Man* (1785) and *Essays on the Active Powers of the Human Mind* (1788), the latter discussing free will, principles of action, and morals. He married his cousin Elizabeth in 1740; she and most of their children predeceased him, leaving only a daughter. Reid died of palsy in Glasgow and was buried at Blackfriars Church.
Philosophically, Reid argued that common sense (*sensus communis*) must underpin all inquiry. He rejected Hume’s claim that knowledge is limited to ideas in the mind and Berkeley’s view that the external world is merely ideas. Instead, he advocated direct realism, arguing that common sense principles justify belief in an external world. He opposed the Theory of Ideas of Locke, Descartes, and others. Though he admired Hume, Hume criticized Reid’s work for implying innate ideas. Reid saw epistemology as a prelude to practical ethics: once common beliefs are confirmed, we act on them. His moral philosophy, influenced by Roman stoicism and Cicero, emphasized agency and self-control. He held that reason presupposes certain first principles—such as that q
- field
- Philosophy
- nationality
- Scottish
- known_for
- Scottish School of Common Sense, agent-causal theory of free will, direct realism, criticism of David Hume
Lore & Background
Thomas Reid was a Scottish philosopher and founder of the Scottish School of Common Sense, a key figure in the Scottish Enlightenment. He was born in the manse at Strachan, Aberdeenshire, and educated at Marischal College, Aberdeen, where he earned his M.A. He began his career as a minister of the Church of Scotland before becoming a professor at King’s College, Aberdeen, and later the Professor of Moral Philosophy at the University of Glasgow, succeeding Adam Smith. He was a joint founder of the Royal Society of Edinburgh and, earlier, the Aberdeen Philosophical Society, known as the ‘Wise Club’. Reid is best known for his philosophical method and theory of perception, which had wide implications for epistemology, and for developing an agent-causal theory of free will. He advocated direct realism, or common sense realism, arguing against the Theory of Ideas held by philosophers such as John Locke and René Descartes. His works include *An Inquiry Into the Human Mind on the Principles of Common Sense*, *Essays on the Intellectual Powers of Man*, and *Essays on the Active Powers of the Human Mind*, which discuss free will, principles of action, and morals. Reid was a contemporary and fierce critic of David Hume, and in his day was regarded as more important than Hume. He died of palsy in Glasgow and was buried at Blackfriars Church.
Reader's Guide
His epistemology was closely tied to his moral philosophy, which emphasized agency and self-control, reminiscent of Roman stoicism. Reid's work influenced later philosophers and, in his day, he was regarded as more important than Hume. His legacy includes a novel mixture of direct realism and ordinary language philosophy, as well as a theory of language distinguishing natural and artificial signs. His ideas remain relevant in discussions of perception, free will, and the foundations of knowledge.
Did You Know?
- He was called to replace Adam Smith as Professor of Moral Philosophy at the University of Glasgow.
- Reid's wife and 'numerous' children predeceased him, except for one daughter.
- He died of palsy and was buried at Blackfriars Church in Glasgow.
Frequently Asked Questions
What is the Scottish School of Common Sense?
It is the philosophical tradition Reid founded, holding that ordinary human faculties—perception, memory, moral judgment—give us direct, reliable access to the external world without a skeptical intermediary. Reid argued these common-sense principles are foundational and cannot be doubted without self-contradiction.
What is Reid's agent-causal theory of free will?
Reid proposed that a rational agent is itself the efficient cause of its voluntary actions, rather than merely a passive link in a chain of prior events. In his view, genuine freedom requires the mind to be a primary initiator of action, not just a receiver of causal impulses.
How did Reid's rivalry with David Hume play out?
Reid was Hume's most persistent and philosophically serious critic, challenging Hume's skepticism about causation, personal identity, and the external world. Their disagreement became one of the defining intellectual rivalries of the eighteenth-century Scottish Enlightenment.
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