Always recognize that human individuals are ends, and do not use them as means to your end.
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.
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. Act that your principle of action might safely be made a law for the whole world.
Ingratitude is the essence of vileness.
Science is organized knowledge. Wisdom is organized life.
Metaphysics is a dark ocean without shores or lighthouse, strewn with many a philosophic wreck. It is not God’s will merely that we should be happy, but that we should make ourselves happy.
Morality is not really the doctrine of how to make ourselves happy but of how we are to be worthy of happiness
I had therefore to remove knowledge, in order to make room for belief.
To be is to do. Perpetual Peace is only found in the graveyard.
Immanuel Kant (22 April 1724 – 12 February 1804) was a German philosopher