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April 10, 2026
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"With Kant, then, external reality thus drops almost totally out of the picture, and we are trapped inescapably in subjectivity—and that is why Kant is a landmark. Once reason is in principle severed from reality, one then enters a different philosophical universe altogether. This interpretive point about Kant is crucial and controversial. An analogy may help drive the point home. Suppose a thinker argued the following: 'I am an advocate of freedom for women. Options and the power to choose among them are crucial to our human dignity. And I am wholeheartedly an advocate of women’s human dignity. But we must understand that a scope of a woman’s choice is confined to the kitchen. Beyond the kitchen’s door she must not attempt to exercise choice. Within the kitchen, however, she has a whole feast of choices—whether to cook or clean, whether to cook rice or potatoes, whether to decorate in blue or yellow. She is sovereign and autonomous. And the mark of a good woman is a well-organized and tidy kitchen.' No one would mistake such a 'thinker for an advocate of woman’s freedom. Anyone would point 'out that there is a whole world beyond the kitchen and that 'freedom is essentially about exercising choice about defining and 'creating one’s place in the world as a whole. The key point about Kant, to draw the analogy crudely, is that he prohibits knowledge of anything outside our skulls. He gives reason lots to do within the skull, and he does advocate a well-organized and tidy mind, but this hardly makes him a champion of reason. The point for any advocate of reason is that there is a whole world outside our skulls, and reason is essentially about knowing it. Kant’s contemporary Moses Mendelssohn was thus prescient in identifying Kant as 'the all-destroyer.'"
"[I]t looks in the first moment as though his central concept of the "synthetic judgements a priori" had been completely annihilated by the discoveries of our century. The theory of relativity has... revealed entirely new features of space and time, of which nothing is seen in Kant's a priori forms of pure intuition. The law of causality is no longer applied in quantum theory and the law of conservation of matter is no longer true for the elementary particles. Obviously Kant could not have foreseen the new discoveries, but since he was convinced that his concepts would be "the basis of any future metaphysics that can be called science" it is interesting to see where his arguments have been wrong."
"Then there's philosophy -- supposed to tackle everything. Does it? All any philosopher ever comes out with is exactly what be walked in with -- except for those self-deluded who prove their assumptions by their conclusions, in a circle. Like Kant."
"In an order so extended as to transcend the comprehension and possible guidance of any single mind, a unified will can indeed hardly determine the welfare of its several members in terms of some particular conception of justice, or according to an agreed scale. Nor is this due merely to the problems of anthropomorphism. [...] The insight that general rules must prevail for spontaneity to flourish, as reaped by Hume and Kant, has never been refuted, merely neglected or forgotten."
"I am almost amazed that you consider a professional philosopher capable of no confusion in concepts and definitions. Such things are nowhere more at home than among philosophers who are not mathematicians, and Wolff was no mathematician, even though he made cheap compen- diums. Look around among the philosophers of today, among Schelling, Hegel, Nees von Esenbeck, and their like; doesn't your hair stand on end at their definitions? Read in the history of ancient philosophy what kinds of definitions the men of that day, Plato and others, gave (I except Aristotle). But even in Kant it is often not much better; in my opinion his distinction between analytic and synthetic theorems is such a one that either peters out in a triviality or is false."
"I am obviously schematizing a very long history, which is, however, fundamental. After Descartes, we have a subject of knowledge which poses for Kant the problem of knowing the relationship between the subject of ethics and that of knowledge. There was much debate in the Enlightenment as to whether these two subjects were completely different or not. Kant's solution was to find a universal subject that, to the extent it was universal, could be the subject of knowledge, but which demanded, nonetheless, an ethical attitude-precisely the relationship to the self which Kant proposes in The Critique of Practical Reason."
"Kant is a sort of highway with lots and lots of milestones. Then all the little dogs come and each deposits his contribution at the milestones."
"All that is necessary is the statement of a set of rules, since without such rules the acquisition of knowledge in the desired sense would be impossible. One may compare these rules with the rules of a game in which, while the rules themselves are arbitrary, it is their rigidity alone which makes the game possible. However, the fixation will never be final. It will have validity only for a special field of application (i.e. there are no final categories in the sense of Kant)."
"The very fact that the totality of our sense experiences is such that by means of thinking (operations with concepts, and the creation and use of definite functional relations between them, and the coordination of sense experiences to these concepts) it can be put in order, this fact is one which leaves us in awe, but which we shall never understand. One may say " the eternal mystery of the world is its comprehensibility." It is one of the great realizations of Immanuel Kant that the setting up of a real external world would be senseless without this comprehensibility."
"Where Kant primarily influenced Hayek was in ontology and metaphysics—Hayek’s comprehensive and total view of the world and of life experience—as a number of writers and philosophers, including Tibor Machan, maintain. Machan remarks that Hayek’s “conception of how we are aware of reality manifests his basically Kantian framework.” Hayek, following in a long line of Germanic and idealist philosophers, adopted a view of reality as “the relation between the physical and the sensory world,” in the tradition of Kant, a tradition that, Hayek held, “goes back to Galileo Galilei, who in 1623 had written: ‘I think that these tastes, odors, colors, etc. are nothing else than mere names, but hold their residence solely in the sensitive body, so that, if the animal were removed, any such quality would be abolished and annihilated.’”"
"The great achievement of Kant is to have shown, once for all, that the external world is known to us only as sensation; and that the mind is no mere helpless tabula rasa, the inactive victim of sensation, but a positive agent, selecting and reconstructing experience as experience arrives. We can make subtractions from this accomplishment without injuring its essential greatness… There is something of a severe Scotch Calvinism in this opposition of duty to happiness; Kant continues Luther and the Stoic Reformation:, as Voltaire continues Montaigne and·the Epicurean Renaissance. He represented a stern reaction against the egoism and hedonism in which Helvetius and Holbach had formulated the life of their reckless era, very much as Luther had reacted against the luxury and laxity of Mediterranean Italy. But after a century of reaction against the absolutism of Kant’s ethics, we find ourselves again in a welter of urban sensualism and immorality, of ruthless individualism untempered with democratic conscience or aristocratic honor; and perhaps the day will soon come when a disintegrating civilization will welcome again the Kantian call to duty… After a century of struggle between the idealism of Kant, variously reformed, and the materialism of the Enlightenment, variously redressed, the victory seems to lie with Kant. Philosophy will never again be so naive as in her earlier and simpler days; she must always be different hereafter, and profounder, because Kant lived."
"Kant does in fact suggest that some cultures may be more adept than others at teaching their members to use the freedom that is their natural gift. But the social and political spheres can have nothing to do with the giving of this gift in the first place. Kant writes that in the social and political spheres, the goal is to balance competing inclinations through a system of competing coercions; the effect of society and politics on individuals is therefore entirely heteronomous."
"Kant's attitude toward Newton's absolute space is somewhat confused. At times he defends the absoluteness... At other times he presents his own arguments in favor of the relativity of space and motion. ...At any rate the problem of the absoluteness of space and time in classical science refers not to the essence of space and time ( a problem which would degenerate into one of metaphysics, hence would be meaningless to the scientists), but solely to a discussion of those conceptions which are demanded of the world of experience. Hence we may realise that a man ignorant of mechanics is in no position to pass an opinion one way or the other. And Kant's knowledge of Newtonian mechanics was extremely poor, to say the least. Thus in his Allgemeine Naturgeschichte und Theorie des Himmels [General History of Nature and Theory of the Heavens], we find him giving incorrect formulæ for the most elementary facts concerning falling bodies. Then again, basing his arguments on what he claims to be the laws of dynamics, he tells us of a nebula which would set itself into rotation owing to its outer parts falling towards the centre and rebounding sideways against the inner parts. But this hypothesis is in flagrant opposition to the principles of dynamics, and had Kant spoken of a man pulling himself up by the bootstraps he would have given expression to no greater absurdity. Whereas this latter statement would violate the principle of action and reaction, Kant's violates the principle of the constancy of the angular momentum of an isolated dynamical system."
"We cannot assert with Kant that the propositions of Euclidean geometry possess any universal truth even when restricting ourselves to this particular world in which we live."
"An idealist, Kant separated the phenomenal world from a world of "things in themselves." He believed that science could offer only mechanical explanations, but he affirmed that in areas where such explanations were inadequate, scientific knowledge needed to be supplemented by considering nature as being purposeful."
"Berkeley, Hume, Kant, Fichte, Hegel, James, Bergson all are united in one earnest attempt, the attempt to reinstate man with his high spiritual claims in a place of importance in the cosmic scheme."
"Clearness and vividness in writing often turn on mere specificity. To say that Major André was hanged is clear and definite; to say that he as killed is less definite, because you do not know in what way he was killed; to say that he died is still more indefinite because you do not even know whether his death was due to violence or to natural causes. If we were to use this statement as a varying symbol by which to rank writers for clearness, we might, I think, get something like the following: Swift, Macauley, and Shaw would say that André was hanged. Bradley would say that he was killed. Bosanquet would say that he died. Kant would say that his mortal existence achieved its termination. Hegel would say that a finite determination of infinity had been further determined by its own negation."
"Through Kant’s philosophical works, the concept of criticism took on an almost magical meaning for the younger generation [of Germans in the Romantic movement]. To be critical meant to raise thought so far above all constraint that, through the perception of the falseness of constraints, knowledge of the truth takes flight as if by magic."
"For it is only in the Critique that all the various strands of Kant's thought are woven together into the pattern of his practical philosophy. This pattern, in turn, can be understood only in the entire fabric of the critical philosophy, and that rich design can be clear only to those who have understood each of its three principal parts, which are the three Critiques and not shorter and more popular works like the Prolegomena and the Foundations."
"The new will prove to be a critical philosophy more subtle and more synthetic than was Kantian philosophy in respect to Newtonian science. Relativistic criticism does not limit itself to a revolution of means of explanation. It is more profoundly revolutionary. It is more génial."
"The innocent sounding First Thesis, taken seriously, forces us to move our attention away from the individual toward humanity. Since there are no limits to the application of reason, and reason does not work instinctively, but requires "trial, practice, and instruction in order to gradually progress from one level of insight to another," individual human beings do not live long enough to learn the full use of reason. However, we find nature setting a short period for individual lives, but producing a series of generations in which each passes its own accomplishments onto its successor. The only way to make the capability of reasoning consistent with the First Thesis is to assume that rationality is to be fully developed only in the race, not in the individual."
"If ... the ability to tell right from wrong should turn out to have anything to do with the ability to think, then we must be able to "demand" its exercise from every sane person, no matter how erudite or ignorant, intelligent or stupid, he may happen to be. Kant—in this respect almost alone among the philosophers—was much bothered by the common opinion that philosophy is only for the few, precisely because of its moral implications."
"The slow progress towards juster international relations may be traced to the distinguished jurist of the Netherlands, Grotius; to the great German, Immanuel Kant, who lifted the subject of “Eternal Peace’ high above controversy; to Count Tolstoy of Russia, who so trenchantly set it forth in our own day, and so on throughout the nations."
"If the truth shall kill them, let them die."
"To be is to do."
"Do what is right, though the world may perish."
"Experience without theory is blind, but theory without experience is mere intellectual play."
"Thus our duties to animals are indirectly duties to humanity."
"The more we devote ourselves to observing animals and their behaviour, the more we love them, on seeing how gready they care for their young; in such a context, we cannot even contemplate cruelty to a wolf. Leibnitz put the grub he had been observing back on the tree with its leaf, lest he should be guilty of doing any harm to it. It upsets a man to destroy such a creature for no reason, and this tenderness is subsequently transferred to man."
"A person who already displays … cruelty to animals is also no less hardened towards men. We can already know the human heart, even in regard to animals."
"Suicide evokes revulsion with horror, because everything in nature seeks to preserve itself: a damaged tree, a living body, an animal; and in man, then, is freedom, which is the highest degree of life, and constitutes the worth of it, to become now a principium for self-destruction? This is the most horrifying thing imaginable. For anyone who has already got so far as to be master, at any time, over his own life, is also master over the life of anyone else; for him, the door stands open to every crime, and before he can be seized he is ready to spirit himself away out of the world. So suicide evokes horror, in that a man thereby puts himself below the beasts. We regard a suicide as a carcase, whereas we feel pity for one who meets his end through fate."
"Man has his own inclinations and a natural will which, in his actions, by means of his free choice, he follows and directs. There can be nothing more dreadful than that the actions of one man should be subject to the will of another; hence no abhorrence can be more natural than that which a man has for slavery. And it is for this reason that a child cries and becomes embittered when he must do what others wish, when no one has taken the trouble to make it agreeable to him. He wants to be a man soon, so that he can do as he himself likes."
"In the natural state no concept of God can arise, and the false one which one makes for himself is harmful. Hence the theory of natural religion can be true only where there is no science; therefore it cannot bind all men together."
"In the metaphysical elements of aesthetics the various nonmoral feelings are to be made use of; in the elements of moral metaphysics the various moral feelings of men, according to the differences in sex, age, education, and government, of races and climates, are to be employed."
"I am an investigator by inclination. I feel a great thirst for knowledge and an impatient eagerness to advance, also satisfaction at each progressive step. There was a time when I thought that all this could constitute the honor of humanity, and I despised the mob, which knows nothing about it. Rousseau set me straight. This dazzling excellence vanishes; I learn to honor men, and would consider myself much less useful than common laborers if I did not believe that this consideration could give all the others a value, to establish the rights of humanity."
"Man's greatest concern is to know how he shall properly fill his place in the universe and correctly understand what he must be in order to be a man."
"The evil effect of science upon men is principally this, that by far the greatest number of those who wish to display a knowledge of it accomplish no improvement at all of the understanding, but only a perversity of it, not to mention that it serves most of them as a tool of vanity."
"The more one presupposes that his own power will suffice him to realize what he desires the more practical is that desire. When I treat a man contemptuously, I can inspire him with no practical desire to appreciate my grounds of truth. When I treat any one as worthless, I can inspire him with no desire to do right."
"Character means that the person derives his rules of conduct from himself and from the dignity of humanity. Character is the common ruling principle in man in the use of his talents and attributes. Thus it is the nature of his will, and is good or bad. A man who acts without settled principles, with no uniformity, has no character. A man may have a good heart and yet no character, because he is dependent upon impulses and does not act according to maxims. Firmness and unity of principle are essential to character."
"There must be a seed of every good thing in the character of men, otherwise no one can bring it out. Lacking that, analogous motives, honor, etc., are substituted. Parents are in the habit of looking out for the inclinations, for the talents and dexterity, perhaps for the disposition of their children, and not at all for their heart or character."
"Good and strong will. Mechanism must precede science (learning). Also in morals and religion? Too much discipline makes one narrow and kills proficiency. Politeness belongs, not to discipline, but to polish, and thus comes last."
"The child must be brought up free (that he allow others to be free). He must learn to endure the restraint to which freedom subjects itself for its own preservation (experience no subordination to his command). Thus he must be disciplined. This precedes instruction. Training must continue without interruption. He must learn to do without things and to be cheerful about it. He must not be obliged to dissimulate, he must acquire immediate horror of lies, must learn so to respect the rights of men that they become an insurmountable wall for him. His instruction must be more negative. He must not learn religion before he knows morality. He must be refined, but not spoiled (pampered). He must learn to speak frankly, and must assume no false shame. Before adolescence he must not learn fine manners ; thoroughness is the chief thing. Thus he is crude longer, but earlier useful and capable."
"If you punish a child for being naughty, and reward him for being good, he will do right merely for the sake of the reward; and when he goes out into the world and finds that goodness is not always rewarded, nor wickedness always punished, he will grow into a man who only thinks about how he may get on in the world, and does right or wrong according as he finds either of advantage to himself."
"[T]he first characteristic of the human species is man's ability, as a rational being, to establish character for himself, as well as for the society into which nature has placed him. This ability, however, presupposes an already favorable natural predisposition and an inclination to the good in man, because the evil is really without character (since it is at odds with itself, and since it does not tolerate any lasting principle within itself)"
"England and France, the two most civilized nations on earth, who are in contrast to each other because of their different characters, are, perhaps chiefly for that reason, in constant feud with one another. Also, England and France, because of their inborn characters, of which the acquired and artificial character is only the result, are probably the only nations who can be assumed to have a particular and, as long as both national characters are not blended by the force of war, unalterable characteristics. That French has become the universal language of conversation, especially in the feminine world, and that English is the most widely used language of commerce among tradesmen, probably reflects the difference in their continental and insular geographic situation."
"The woman wants to dominate, the man wants to be dominated[.]"
"Nature made women mature early and had them demand gentle and polite treatment from men, so that they would find themselves imperceptibly fettered by a child due to their own magnanimity; and they would find themselves brought, if not quite to morality itself, then at least to that which cloaks it, moral behavior, which is the preparation and introduction to morality."
"All... good and useful properties of character have a price in exchange for others which have just as much use. Talent has a market price, since the sovereign or estate-owner can use a talented person in all sorts of ways. Temperament has a fancy price,22 since one can converse well with such a person; he is a pleasant companion. But, character has an inner value[,] and it is above all price."
"The man of principles has character. Of him we know definitely what to expect. He does not act on the basis of his instinct, but on the basis of his will. Therefore, without being redundant one can classify characteristics according to a person's faculty of desire (what is practical), as a) his nature, or natural talent, b) his temperament, or disposition, and c) his general character, or mode of thinking."
"[T]his species works intentionally on its own destruction (by war). This, however, does not keep the rational creatures of such a constantly advancing culture, even in the midst of war, from promising to mankind in coming centuries an unequivocal prospect of bliss which will never end."