We can judge the heart of a man by his treatment of animals.
Rules for Happiness: something to do, someone to love, something to hope for.
From such crooked wood as that which man is made of, nothing straight can be fashioned.
Out of the crooked timber of humanity, no straight thing was ever made.
All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason.
Look closely. The beautiful may be small.
Freedom is the alone unoriginated birthright of man, and belongs to him by force of his humanity; and is independence on the will and co-action of every other in so far as this consists with every other person’s freedom.
A society that is not willing to demand a life of somebody who has taken somebody else’s life is simply immoral.
Whereas the beautiful is limited, the sublime is limitless, so that the mind in the presence of the sublime, attempting to imagine what it cannot, has pain in the failure but pleasure in contemplating the immensity of the attempt.
Aus so krummen Holze, als woraus der Mensch gemacht ist, kann nichts ganz Gerades gezimmert werden. Out of the crooked timber of humanity, no straight thing can ever be made.
A man who has tasted with profound enjoyment the pleasure of agreeable society will eat with a greater appetite than he who rode horseback for two hours. An amusing lecture is as useful for health as the exercise of the body.
Two things awe me most, the starry sky above me and the moral law within me.
Experience without theory is blind, but theory without experience is mere intellectual play.
The question is not so much whether there is life on Mars as whether it will continue to be possible to live on Earth.
Live your life as though your every act were to become a universal law.
I had therefore to remove knowledge, in order to make room for belief.
Act that your principle of action might safely be made a law for the whole world.
Always recognize that human individuals are ends, and do not use them as means to your end.
The instruction of children should aim gradually to combine knowing and doing. Among all sciences mathematics seems to be the only one of a kind to satisfy this aim most completely.
Act in such a way that you treat humanity, whether in your own person or in the person of any other, never merely as a means to an end, but always at the same time as an end.