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Happiness is not an ideal of reason, but of imagination.

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Science is organized knowledge. Wisdom is organized life

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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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But, though all our knowledge begins with experience, it by no means follows that all arises out of experience.

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Simply to acquiesce in skepticism can never suffice to overcome the restlessness of reason.

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Enlightenment is man's release from his self-incurred tutelage. Tutelage is man's inability to make use of his understanding without direction from an...more

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...new prejudices will serve as well as old ones to harness the great unthinking masses.For this enlightenment, however, nothing is required but freed...more

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An age cannot bind itself and ordain to put the succeeding one into such a condition that it cannot extend its (at best very occasional) knowledge , p...more

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An age cannot bind itself and ordain to put the succeeding one into such a condition that it cannot extend its (at best very occasional) knowledge , p...more

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Laziness and cowardice are the reasons why so great a portion of mankind, after nature has long since discharged them from external direction (natural...more

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That all our knowledge begins with experience there can be no doubt. For how should the faculty of knowledge be called into activity, if not by object...more

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I had to deny knowledge in order to make room for faith.

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Metaphysics... is nothing but the inventory of all we possess through pure reason, ordered systematically. Nothing here can escape us, because what re...more

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(On the seeming futility of metaphysics) Why then has nature afflicted our reason with the restless striving for such a path, as if it were one of rea...more

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Philosophical knowledge is knowledge which reason gains from concepts mathematical knowledge is knowledge which reason gains from the construction of ...more