What can I know? What ought I to do? What can I hope?
Even philosophers will praise war as ennobling mankind, forgetting the Greek who said: 'War is bad in that it begets more evil than it kills.'
Metaphysics is a dark ocean without shores or lighthouse, strewn with many a philosophic wreck.
Thoughts without content are empty, intuitions without concepts are blind.
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.
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.
May you live your life as if the maxim of your actions were to become universal law.
It is beyond a doubt that all our knowledge that begins with experience.