Immanuel Kant

“The senses do not err — not because they always judge rightly, but because they do not judge at all.”

“By a lie a man throws away and, as it were, annihilates his dignity as a man.”

“I have therefore found it necessary to deny knowledge in order to make room for faith.”

“Thoughts without content are empty, intuitions without concepts are blind.”

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

“Two things fill the mind with ever-increasing wonder and awe, the more often and the more intensely the mind of thought is drawn to them: the starry heavens above me and the moral law within me.”

“In the kingdom of ends everything has either a price or a dignity. What has a price can be replaced by something else as its equivalent; what on the other hand is raised above all price and therefore admits of no equivalent has a dignity.”

“I ought never to act except in such a way that I could also will that my maxim should become a universal law.”

“Act so as to treat humanity, whether in your own person or in that of another, at all times also as an end, and not only as a means.”

“There is nothing at all in the world that one can think of, or even out of it, that can be held good without qualification, except a good will.”

“Enlightenment is man's leaving his self-caused immaturity. Immaturity is the incapacity to use one's intelligence without the guidance of another.”

“Out of the crooked timber of humanity, no straight thing was ever made.”

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