"A categorical imperative is an imperative that commands a certain conduct immediately, without having as its condition any other purpose to be attained by it."

"Dare to know! (Sapere aude.) 'Have courage to use your own understanding!'—that is the motto of enlightenment."

"Act only according to that maxim whereby you can at the same time will that it should become a universal law without contradiction."

"The fact that the beautiful is the symbol of the morally good, and that it is only in this respect that it gives us pleasure with a claim to the agreement of everyone, is a point of which everyone wou…"

"The greatest human perfection is to perform one's duty."