Science is organized knowledge. Wisdom is organized life.
I had therefore to remove knowledge, in order to make room for belief.
In law a man is guilty when he violates the rights of others. In ethics he is guilty if he only thinks of doing so.
It is not God's will merely that we should be happy, but that we should make ourselves happy.
Two things awe me most, the starry sky above me and the moral law within me.
Ingratitude is the essence of vileness.
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.
To be is to do.
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.
But although all our knowledge begins with experience, it does not follow that it arises from experience.
Immaturity is the incapacity to use one's intelligence without the guidance of another.
Religion is the recognition of all our duties as divine commands.
Out of timber so crooked as that from which man is made nothing entirely straight can be carved.
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.
Morality is not the doctrine of how we may make ourselves happy, but how we may make ourselves worthy of happiness.
Always recognize that human individuals are ends, and do not use them as means to your end.
It is beyond a doubt that all our knowledge begins with experience.
It is not necessary that whilst I live I live happily; but it is necessary that so long as I live I should live honourably.
Live your life as though your every act were to become a universal law.
Thoughts without content are empty, intuitions without concepts are blind.