The greatest human quest is to know what one must do in order to become a human being.

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

I had therefore to remove knowledge, in order to make room for belief.

Freedom is the alone unoriginated birthright of man, and belongs to him by force of his humanity.

Thoughts without content are empty, intuitions without concepts are blind.

A man who has tasted with profound enjoyment the pleasure of agreeable society will eat with a greater appetite than he who rode horseback for two hours. An amusing lecture is as useful for health as the exercise of the body.

Give a man everything he wants and at that moment everything is not everything