“Have the courage to use your own reason- That is the motto of enlightenment.
"Foundations of the Metaphysics of
Morals" (1785)”

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German philosopher 1724–1804

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“Sapere Aude! Have the courage to use your own intelligence!”

Immanuel Kant (1724–1804) German philosopher

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Variant: Have the courage to use your own reason- That is the motto of enlightenment.
Source: Groundwork of the Metaphysics of Morals
Context: 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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“You are your own forerunner, and the towers you have builded are but the foundation of your giant-self. And that self too shall be a foundation.”

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Context: You are your own forerunner, and the towers you have builded are but the foundation of your giant-self. And that self too shall be a foundation.
And I too am my own forerunner, for the long shadow stretching before me at sunrise shall gather under my feet at the noon hour. Yet another sunrise shall lay another shadow before me, and that also shall be gathered at another noon.
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“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.”

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“Capitulation, sycophancy, and cowardice will only undermine us… Sometimes, you have to courageously follow your own path and not try to curry favor with anyone.”

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“While the easiest way in metaphysics is to condemn all metaphysics as nonsense, the easiest way in morals is to elevate the common practice of the community into a moral absolute.”

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“The foundation of morality is to have done, once and for all, with lying”

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