All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason.Immanuel Kant
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.Immanuel Kant
But although all our knowledge begins with experience, it does not follow that it arises from experience.Immanuel Kant
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 to do? 3. What may I hope?Immanuel Kant
The only objects of practical reason are therefore those of good and evil. For by the former is meant an object necessarily desired according to a principle of reason; by the latter one necessarily shunned, also according to a principle of reason.Immanuel Kant
A categorical imperative would be one which represented an action as objectively necessary in itself, without reference to any other purpose.Immanuel Kant
