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A similar experiment may be tried in metaphysics as regards the *intuition* of objects. If the intuition had to conform to the constitution of objects...more

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The people naturally adhere most to doctrines which demand the least self-exertion and the least use of their own reason, and which can best accommoda...more

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Metaphysics, a completely isolated and speculative branch of rational knowledge which is raised above all teachings of experience and rests on concept...more

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This experiment succeeds as hoped and promises to metaphysics, in its first part, which deals with those *a priori* concepts to which the correspondin...more

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Settle, for sure and universally, what conduct will promote the happiness of a rational being.

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On the other hand, the moral law, although it gives no such prospect, does provide a fact absolutely inexplicable from any data of the world of sense ...more

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He who is cruel to animals becomes hard also in his dealings with men. We can judge the heart of a man by his treatment of animals.

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By this freedom the will of a rational being, as belonging to the sensuous world, recognizes itself to be, like all other efficient causes, necessaril...more

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The whole interest of my reason, whether speculative or practical, is concentrated in the three following questions: What can I know? What should I do...more

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An action, to have moral worth, must be done from duty.

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The death of dogma is the birth of morality.

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If we were to suppose that mankind never can or will be in a better condition, it seems impossible to justify by any kind of theodicy the mere fact th...more

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But only he who, himself enlightened, is not afraid of shadows.

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We have seen, therefore, that I am not allowed even to *assume*, for the sake of the necessary practical use of my reason *God, freedom, immortality*,...more

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Morality is not the doctrine of how we may make ourselves happy, but how we may make ourselves worthy of happiness.