German philosopher and one of the central Enlightenment thinkers
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.
A categorical imperative would be one which represented an action as objectively necessary in itself, without reference to any other purpose.
May you live your life as if the maxim of your actions were to become universal law.
Nothing is divine but what is agreeable to reason.
Always recognize that human individuals are ends, and do not use them as means to your end.
Thoughts without content are empty, intuitions without concepts are blind.
Out of timber so crooked as that from which man is made nothing entirely straight can be carved.
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.
If man makes himself a worm he must not complain when he is trodden on.