Kant, Immanuel

"Understanding is intelligence applied."

"We cannot teach anyone anything; we can only help them discover it within themselves."

"If the mind is to understand other minds, it must look beyond itself."

"The greatest deception is self-deception."

"To love humanity in such a way as is consistent with the claims of human dignity."

"Art is the production of a thing as a purpose in itself."

"Happiness is not the highest good; virtue is."

"The kingdom of ends exists not merely as an ideal but as something to be realized."

"There is a duty to be cultivated with special care—the duty of gratitude."

"Without sensibility, the intellect is empty; without understanding, the senses are blind."

"Time is not something which exists of itself or which inheres in things as an objective determination."

"Questions asked in ignorance are marked by stupidity."

"True practical philosophy must build on principles, not emotions."

"Duty is the necessity of an action from respect for the moral law."

"Nature acts mechanically; reason acts for a purpose."

"Universal laws can only come from a good will acting morally."

"The understanding is a faculty that thinks, and reason is a faculty that judges."

"In the moral world, intention is everything."

"We can know phenomena, but we can never know the thing-in-itself."

"All aesthetic judgments are subjective universals."

"Friendship is a relationship where both parties see the best in each other."

"The desire for recognition is the fundamental human drive."

"Reason is the capacity to follow universal laws."

"A lie always does more harm in the long run."

"The moral law is within; the starry heavens without."

"We exist as rational beings capable of moral action."

"Knowledge is power only when it is applied with moral purpose."

"Enthusiasm is the ecstasy of duty."

"The beautiful is that which is universally liked without a concept."

"History is the record of human moral progress."