Immanuel Kant (1724-1804) quotes

• Act that your principle of action might safely be made a law for the whole world.
• All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason.
• All the interests of my reason, speculative as well as practical, combine in the three following questions: 1. What can I know? 2. What ought I do? 3. What may I hope?
• Always recognize that human individuals are ends, and do not use them as means to your end.
• By a lie, a man... annhilates his dignity as a man.
• Even philosophers will praise war as ennobling manking, forgetting the Greek who said "War is bad in that it begets more evil than it kills".
• Experience without theory is blind, but theory without experience is mere intellectual play.
• From such crooked wood as that which man is made of, nothing straight can be fashioned.
• Happiness is not an ideal of reason, but of imagination.
• 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.
• I had therefore to remove knowledge, in order to make room for belief.
• If man makes himself a worm he must not complain when he is trodden on.
• Immaturity is the incapacity to use one's intelligence without the guidance of another.
• 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.
• Ingratitude is the essence of vileness.
• It is not God's will merely that we should be happy, but that we should make ourselves happy.
• 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.
• Religion is the recognition of all our duties as divine commands.
• Thoughts without content are empty, intuitions without concepts are blind.
• To be is to do.
• Two things awe me most, the starry sky above me and the moral law within me.