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Immanuel Kant spent his entire life in Königsberg, a small German town on the Baltic Sea in East Prussia. (After World War II, Germany's border was pushed west, so Königsberg is now called Kaliningrad and is part of Russia.) He was the son of a poor saddle-maker, but because of his evident intelligence he was sent to university. After receiving a doctoral degree from the Faculty of Philosophy at the University of Königsberg.
At the age of fifty-five, Kant had published much work on the natural sciences, taught at Königsberg University for over twenty years—where he lectured on a variety of topics including cosmology and anthropology, as well as philosophy—and achieved a good reputation in German literary circles. During the last twenty-five years of his life, however, Kant's philosophical work placed him firmly in the company of such towering giants as Plato and Aristotle. Kant's three major works are often considered to be the starting points for different branches of modern philosophy: Critique of Pure Reason (1781) for the philosophy of mind; Critique of Practical Reason (1788) for moral philosophy; and Critique of Judgment (1790) for aesthetics, the philosophy of art. Kant continued to think and write well into his old age, and he was at work on a fourth Critique at the time of his death in 1804.
Kant lived an exceptionally quiet, uneventful, regular life, never marrying or traveling far from Konigsberg. His sedentary, routine life has often been the source of derision from his critics. Allegedly, the housewives of Königsberg set their clocks every day of his professional life by his daily walk—except for one day when, in his engrossment with Jean Jacque Rousseau's novel Emile, he forgot the walk. On the other hand, Kant's heavy academic workload, moderate income, and weak health may go some ways towards explaining his uneventful life, and perhaps it is simply true that for him his intellectual adventures were adventures enough. We do know that he was quite sociable and also that he took great interest in the latest sciences, which should go some ways toward dispelling the image of Kant as bloodless and interested only in his own abstractions.
Immanuel Kant is a nexus of modern philosophy. He brings together everything that came before him, and is the starting point for everything that came after him. The philosophy of the 17th and 18th centuries is generally characterized as being split between empiricists (most of whom were British) and rationalists (most of whom were French or German). While Kant was taught in a thoroughly rationalist tradition, he was able to use the best philosophy of both groups and reconcile their differences.
The rationalists placed a heavy emphasis on metaphysics and knowledge gained through the exercise of the unaided intellect. They were skeptical about knowledge acquired from experience, arguing that the senses are unreliable. Knowledge from experience, they argued, cannot carry the certainty and necessity that characterizes the abstract reasoning of mathematics or geometry. Thus, they set about seeing what other certain or necessary truths they could learn through abstract reason alone. The result was a great deal of energetic speculation as to the nature of God, the ultimate constituents of matter, and the soul. Among the most significant rationalists were Descartes, Spinoza, and Leibniz.
The empiricists, on the other hand, believed strongly in experiential knowledge. John Locke asserted that the mind is a blank slate at birth, and that all our knowledge comes from experience. Even mathematics, he suggests, is built from inferences and generalizations we make regarding experience. The goal of an empiricist is to systematize our knowledge from experience, to show how the complexities of human knowledge are built up from simple sensations. George Berkeley asserted that nothing exists except in experience—"being is being perceived." David Hume argued that we have no rational justification for inferring any general laws about experience, and that our "knowledge" of cause and effect is more a matter of custom than necessity.
Kant said that Hume's skeptical challenge is what first spurred him toward his critical philosophy. Hume asks how we can make inferences regarding experience: how can I predict what will happen in the future based on what has happened in the past? In order to do so, Hume suggests, I must know some sort of "uniformity principle" that says that events in the future will follow the same sorts of general laws that they have followed in the past. But how can I know this uniformity principle? It isn't logically or necessarily true, so I can't simply infer it prior to experience like I can with mathematical knowledge. However, I fall into a vicious circle if I claim that I know it from experience, since I need to already have the uniformity principle in order to infer that—the uniformity principle has been true in the past, and it will continue to be true in the future. Thus, Hume concludes that we cannot know that future events will follow the same laws as past events: we just get into the habit of expecting it.
Kant first answers Hume's skepticism and reconciles rationalism and empiricism in his magnum opus, the Critique of Pure Reason, published in 1781. This book is long, dense, and difficult, and was generally misunderstood. Kant published the Prolegomena two years later as a primer, hoping to make his ideas more accessible.
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