Immanuel Kant

“Live your life as though your every act were to become a universal law.”

“Science is organized knowledge. Wisdom is organized life.”

“It is not God's will merely that we should be happy, but that we should make ourselves happy.”

“I had therefore to remove knowledge, in order to make room for belief.”

“Happiness is not an ideal of reason, but of imagination.”

“All the interests of my reason, speculative as well as practical, combine in the three following questions: 1. What can I know? 2. What ought I to do? 3. What may I hope?”

“All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason.”

“But although all our knowledge begins with experience, it does not follow that it arises from experience.”

“It is beyond a doubt that all our knowledge begins with experience.”

“To be is to do.”

“Immaturity is the incapacity to use one's intelligence without the guidance of another.”

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

“Experience without theory is blind, but theory without experience is mere intellectual play.”

“Intuition and concepts constitute... the elements of all our knowledge, so that neither concepts without an intuition in some way corresponding to them, nor intuition without concepts, can yield knowledge.”

“What can I know? What ought I to do? What can I hope?”