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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!

— Immanuel Kant What is Enlightenment (1784)

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More quotes by Immanuel Kant

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

Critique of Practical Reason (1788)

Apart from moral conduct, all that man thinks himself able to do in order to become acceptable to God is mere superstition and religious folly.

There must be a seed of every good thing in the character of men, otherwise no one can bring it out.

The Educational Theory of Immanuel Kant (1904)

Natural science is throughout either a pure or an applied doctrine of motion.

Metaphysical Foundations of Natural Science (1786)

That all our knowledge begins with experience there can be no doubt.

Critique of Pure Reason (1781)

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The most merciful thing in the world, I think, is the inability of the human mind to correlate all its contents.

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Anyone who believes exponential growth can go on forever in a finite world is either a madman or an economist.

Kenneth Boulding to Kenneth Boulding in: United States. Congress. House (1973)

The greater part of humanity is too much harassed and fatigued by the struggle with want, to rally itself for a new and sterner struggle with error.

Friedrich Schiller On the Aesthetic Education of Man (1794)

The reasonable man adapts himself to the world: the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.

George Bernard Shaw Maxims for Revolutionists (1903)

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Quote text and notes from Wikiquote: Immanuel Kant (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.