The enjoyment of power inevitably corrupts the judgment of reason, and perverts its liberty.

In every department of physical science there is only so much science, properly so-called, as there is mathematics.

Enlightenment is man's emergence from his self-incurred immaturity.

All false art, all vain wisdom, lasts its time but finally destroys itself, and its highest culture is also the epoch of its decay.

Genius is the ability to independently arrive at and understand concepts that would normally have to be taught by another person.

Both love of mankind, and respect for their rights are duties; the former however is only a conditional, the latter an unconditional, purely imperative duty, which he must be perfectly certain not to have transgressed who would give himself up to the secret emotions arising from benevolence.

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.