We know only what we first gather up with our senses. Yet living in the real world does not mean that ideals should be abandoned. In his ‘Critique of Practical Reason' (1788) he argued for a stern morality. His basic idea was in the form of a Categorical Imperative. This meant that humans should act so well that their conduct could give rise to a universal law. Kant died in Königsberg on Feb. 12, 1804. His last words were Es ist gut, “It is good.”.