Instructions 20Q Game: These are similar to full games, but for quizzes larger than 20 questions it will randomly select 20 questions from within the set. This is a quick way to get in some studying of a topic.     
Identify the following philosopher:

(412 BC - 323 BC) Greek philosopher and one of the founders of Cynic philosophy. Modeled himself on the example of Heracles, and believed that virtue was better revealed in action than in theory.
Diogenes
René Descartes
John Stuart Mill
Gottfried Leibniz