No state at war with another state should engage in hostilities of such a kind as to render mutual confidence impossible when peace will have been made.

All trades, arts, and handiworks have gained by division of labor... Where the different kinds of work are not distinguished and divided, where everyone is a jack-of-all-trades, there manufactures remain still in the greatest barbarism.

Apart from moral conduct, all that man thinks himself able to do in order to become acceptable to God is mere superstition and religious folly.

Dare to know! Have the courage to use your own intelligence!

Intuition and concepts constitute... the elements of all our knowledge, so that neither concepts without an intuition in some way corresponding to them, nor intuition without concepts, can yield knowledge.

Physicians think they are doing something for you by labeling what you have as a disease

Philosophy stands in need of a science which shall determine the possibility, principles, and extent of human knowledge à priori.