Science is organized knowledge. Wisdom is organized life.
Morality is not properly the doctrine of how we may make ourselves happy, but how we may make ourselves worthy of happiness.
Live your life as though your every act were to become a universal law.
So act that your principle of action might safely be made a law for the whole world.
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.
All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason.
Seek not the favor of the multitude; it is seldom got by honest and lawful means. But seek the testimony of few; and number not voices, but weigh them.
Thoughts without content are empty, intuitions without concepts are blind.
By a lie, a man… annihilates his dignity as a man.
Immaturity is the incapacity to use one’s intelligence without the guidance of another.
Out of timber so crooked as that from which man is made nothing entirely straight can be carved.
From such crooked wood as that which man is made of, nothing straight can be fashioned.
It is not God’s will merely that we should be happy, but that we should make ourselves happy.
Nothing is divine but what is agreeable to reason.
Experience without theory is blind, but theory without experience is mere intellectual play.
I had therefore to remove knowledge, in order to make room for belief.
Have patience awhile; slanders are not long-lived. Truth is the child of time; erelong she shall appear to vindicate thee.
But although all our knowledge begins with experience, it does not follow that it arises from experience.
May you live your life as if the maxim of your actions were to become universal law.
What can I know? What ought I to do? What can I hope?
Happiness is not an ideal of reason, but of imagination.