Immanuel Kant

"By a lie, a man annihilates his dignity as a human being."

"The real progress of knowledge is to measure what we do not know."

"Life is a game of extreme seriousness."

"Every human being is bound by his own private moral law."

"Imagination is more important than knowledge."

"The success of one is founded on the perseverance of all."

"Nature itself must be the judge."

"What is virtue? It is the strength to do what is right."

"In all judgments we must reach the heart of the matter."

"The greatest discovery of my generation is that human beings can alter their lives by altering their attitudes."

"Hope is not the belief that things will work out, but the belief that things matter."

"The law is the exact road between freedom and despotism."

"Quality of intellect is in direct proportion to the breadth of vision."

"Every occurrence has a cause."

"Art is a moral necessity."

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

"Weakness is the basis of evil."

"In questions of rights, might is wrong."

"The order of nature is the thought of God."

"Being is the basic concept."

"The law of cause and effect is the law of laws."

"All our knowledge rests on the foundation of experience."

"Vanity asks: What is fashionable? Conscience asks: What is right?"

"Never treat a person merely as a means to an end."

"The first duty of man is duty to himself."

"Ingratitude is the essence of vileness."

"We are affected by nothing so much as we are affected by time."

"The world would never have been made if its maker had been looking for applause."

"Ultimate principles are beyond proof."

"Man can only become truly human by education."