Immanuel Kant

"Noumena are things as they exist in themselves, apart from our perception."

"In questions of conscience, the law of the land has no place."

"The highest good must include happiness in proportion to virtue."

"Ignorance is not innocence, but sin."

"We cannot act morally unless we first think clearly."

"All our knowledge begins with the senses, but does not therefore come from the senses."

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

"The categorical imperative is the supreme principle of human conduct."

"A lie is always wrong, even to save a life."

"What we create in our minds becomes real in the world."

"The mind creates order from chaos through the categories of understanding."

"To criticize reason itself is to use reason—a logical contradiction."

"Things that are beautiful without purpose are the most beautiful things of all."

"Passive enjoyment is the path to mediocrity."

"The human being is the purpose of creation; nothing is higher than man."

"Every human being is an end in himself, never a means to another's end."

"A kingdom of ends is possible only if we treat all rational beings as ends in themselves."

"The beauty of nature lies in its purposeless purposiveness."

"Dreams are the first condition for imagination."

"Reason is the highest human faculty."

"The pursuit of knowledge without moral character leads to ruin."

"No one can demand of us to be happy; we have only the duty to make ourselves worthy of happiness."

"The artist must be as disciplined as the mathematician."

"Without history, we are adrift without an anchor."

"Peace is the highest good that we can strive to achieve."

"Revolution is not the answer; evolution of thought is."

"The limits of my language are the limits of my world."

"Time is the condition under which alone our existence is possible."

"A rational being exists as an end in himself."

"The only unalienable right is the right to freedom of thought."