Kant, Immanuel (1724-1804) - Germany's most renowned philosopher, his
writings deal in part with rational understanding. Kant was the first
major philosopher to make his living as a teacher of the subject.
Critique of Pure Reason (1781) - Kant's most famous philosophical work is
an attempt to reconcile rationalism and empiricism. He claims that "though
our knowledge begins with experience, it does not follow that it arises out
of experience."