Out of timber so crooked as that from which man is made nothing entirely straight can be carved.
Morality is not the doctrine of how we may make ourselves happy, but how we may make ourselves worthy of happiness.
It is not God’s will merely that we should be happy, but that we should make ourselves happy.
Always recognize that human individuals are ends, and do not use them as means to your end.
A categorical imperative would be one which represented an action as objectively necessary in itself, without reference to any other purpose.
Nothing is divine but what is agreeable to reason.
Live your life as though your every act were to become a universal law.
All thought must, directly or indirectly, by way of certain characters, relate ultimately to intuitions, and therefore, with us, to sensibility, because in no other way can an object be given to us.
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.
Science is organized knowledge. Wisdom is organized life.