All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason.

Happiness, though an indefinite concept, is the goal of all rational beings

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?

[A ruler is merely] the trustee of the rights of other men and he must always stand in dread of having in some way violated these rights.

Always recognize that human individuals are ends, and do not use them as means to your end.

Happiness is not an ideal of reason, but of imagination.

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.