Experience without theory is blind, but theory without experience is mere intellectual play.
Science is organized knowledge. Wisdom is organized life.
All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason.
Thoughts without content are empty, intuitions without concepts are blind.
So act that your principle of action might safely be made a law for the whole world.
Immaturity is the incapacity to use one's intelligence without the guidance of another.
He who is cruel to animals becomes hard also in his dealings with men. We can judge the heart of a man by his treatment of animals.
Live your life as though your every act were to become a universal law.
Morality is not properly the doctrine of how we may make ourselves happy, but how we may make ourselves worthy of happiness.
Out of timber so crooked as that from which man is made nothing entirely straight can be carved.
Immanuel Kant (//; German: [ɪˈmaːnu̯eːl kant]; 22 April 1724 – 12 February 1804) was a German philosopher who is considered the central figure of modern philosophy. Kant argued that fundamental concepts of the human mind structure human experience, that reason is the source of morality, that aesthetics arises from a faculty of disinterested judgment, that space and time are forms of our sensibility, and that the world as it is "in-itself" is unknowable. Kant took himself to have effected a Copernican revolution in philosophy, akin to Copernicus' reversal of the age-old belief that the sun revolved around the earth. His beliefs continue to have a major influence on contemporary philosophy, especially the fields of metaphysics, epistemology, ethics, political theory, and aesthetics.