Immanuel Kant
Immanuel Kant (1724-1804) was a German philosopher and one of the most influential thinkers in the history of Western philosophy. His work marks a turning point between early modern and modern thought, and remains central to debates about knowledge, ethics, and human freedom.
In his masterpiece, the Critique of Pure Reason, Kant asked what the human mind can and cannot know, arguing that we never experience reality 'as it is in itself' but always through the structures of our own minds. In ethics, his Groundwork of the Metaphysics of Morals introduced the 'categorical imperative' — the idea that we should act only in ways we could will to become universal laws — one of the most important principles in moral philosophy.
Kant lived his entire life in the Prussian city of Konigsberg, following a famously regular daily routine. His ideas reshaped philosophy so completely that almost every later thinker had to respond to him.
Kant's writing is notoriously dense and technical. Our editions aim to present his key ideas as clearly as possible. Read a selection free, and read or listen with a membership.
Immanuel Kant in the library · 3 works
Kant's Prolegomena to Any Future Metaphysics
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Frequently asked questions about Immanuel Kant
What did Immanuel Kant write?
Kant's major works include the Critique of Pure Reason, the Critique of Practical Reason, and the Critique of Judgment — his three great 'Critiques' — along with the more accessible Groundwork of the Metaphysics of Morals and essays such as 'What Is Enlightenment?' His writing spans knowledge, ethics, aesthetics, and politics. The first Critique is his most famous and demanding work.
What is the categorical imperative?
The categorical imperative is Kant's central moral principle: act only according to rules that you could consistently will to become universal laws for everyone. In another formulation, always treat people as ends in themselves and never merely as means. It grounds morality in reason and duty rather than in consequences or feelings, and it remains one of the most discussed ideas in ethics.
Where should I start with Kant?
The Groundwork of the Metaphysics of Morals is the usual starting point — it is shorter and more focused than the great Critiques and lays out his ethics clearly. His short essay 'What Is Enlightenment?' is also very accessible. The Critique of Pure Reason is his masterpiece but is extremely demanding, so it is best approached later.
Why is Kant so important?
Kant reshaped philosophy by arguing that the mind actively structures our experience of the world, rather than passively receiving it — a shift he compared to a 'Copernican revolution' in thought. His ethics, based on reason and universal duty, remain foundational, and his ideas influenced nearly every major philosopher who followed. Modern debates about knowledge, morality, and human rights still draw on him.
Is Kant hard to read?
Yes — Kant is famous for extremely dense, technical prose and a specialised vocabulary, which makes the original Critiques challenging even for scholars. His shorter ethical works are more manageable. A clear modern edition and starting with his more accessible writings make his ideas far easier to grasp.
When did Kant live?
Kant lived from 1724 to 1804 in Konigsberg, in what was then Prussia (now Kaliningrad). He published his major works relatively late in life, beginning with the Critique of Pure Reason in 1781. He was a central figure of the Enlightenment and spent his whole career as a professor in his home city.
Where can I read Kant for free?
Kant's works are in the public domain, and older translations are freely available. They can be very difficult to read. Here you can read a selection free in clearer modern English, and read or listen with a membership.
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