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But a lie is a lie, and in itself intrinsically evil, whether it be told with good or bad intents.
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All our knowledge falls with the bounds of experience.
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Do the right thing because it is right.
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Act that your principle of action might safely be made a law for the whole world.
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Things which we see are not by themselves what we see ... It remains completely unknown to us what the objects may be by themselves and apart from the receptivity of our senses. We know nothing but our manner of perceiving them.
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Criticism alone can sever the root of materialism, fatalism, atheism, free-thinking, fanaticism, and superstition, which can be injurious universally; as well as of idealism and skepticism, which are dangerous chiefly to the Schools, and hardly allow of being handed on to the public.
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Every human being should always be treated as an end and never as a mere instrument.
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The problem of establishing a perfect civic constitution is dependent upon the problem of a lawful external relation among states and cannot be solved without a solution of the latter problem.
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Die menschliche Vernunft hat hier, wie allerwärts in ihrem reinen Gebrauche, so lange es ihr an Kritik fehlt, vorher alle mögliche unrechte Wege versucht, ehe es ihr gelingt, den einzigen wahren zu treffen.
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Human reason is by nature architectonic.
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it is absurd … to hope that maybe another Newton may some day arise, to make intelligible to us even the genesis of but a blade of grass ('Dialectic of Teleological Judgment' §75)
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Two things strike me dumb: the infinite starry heavens, and the sense of right and wrong in man.
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Morality is not properly the doctrine of how we may make ourselves happy, but how we may make ourselves worthy of happiness.
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I have no knowledge of myself as I am, but merely as I appear to myself.
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What can I know? What ought I to do? What may I hope?
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I had therefore to remove knowledge, in order to make room for belief.
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The science of mathematics presents the most brilliant example of how pure reason may successfully enlarge its domain without the aid of experience.
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The wise man can change his mind; the stubborn one, never.
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Enlightenment is man's leaving his self-caused immaturity. Immaturity is the incapacity to use one's intelligence without the guidance of another. Such immaturity is self-caused if it is not caused by lack of intelligence, but by lack of determination and courage to use one's intelligence without being guided by another. Sapere Aude! Have the courage to use your own intelligence! is therefore the motto of the enlightenment.
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Do what is right, though the world may perish.
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All thought must, directly or indirectly, by way of certain characters, relate ultimately to intuitions, and therefore, with us, to sensibility, because in no other way can an object be given to us.
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The means employed by Nature to bring about the development of all the capacities of men is their antagonism in society, so far as this is, in the end, the cause of a lawful order among men.
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Es ist so bequem, unmündig zu sein. Habe ich ein Buch, das für mich Verstand hat, einen Seelsorger, der für mich Gewissen hat, einen Arzt, der für mich die Diät beurtheilt u. s. w., so brauche ich mich ja nicht selbst zu bemühen. Ich habe nicht nöthig zu denken, wenn ich nur bezahlen kann.
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A single line in the Bible has consoled me more than all the books I ever read besides.