Immanuel Kant

“Act only according to that maxim whereby you can, at the same time, will that it should become a universal law.”

“The world will little note, nor long remember what we say here, but it can never forget what they did here.”

“All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is no other source.”

“There is no possibility of thinking of anything in the world, or even out of it, which can be regarded as good without qualification, except a good will.”

“The greatest enemy of truth is not the lie—deliberate, contrived and dishonest—but the myth—persistent, persuasive and unrealistic.”

“The only object of the practical reason is, then, to produce a will which is good not empirically, not as a means to arbitrary ends, but as good in itself.”

“The will is nothing else than practical reason.”

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

“What is freedom but the right to do that which others have forbidden?”

“From the crooked timber of humanity, no straight thing can ever be made.”