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:

(1872-1862) American essayist, poet, and philosopher. Best known for his book "Walden", a reflection upon simple living in natural surroundings, and his essay "Civil Disobedience", an argument for disobedience to an unjust state.
Henry David Thoreau
Zeno of Elea
Søren Kierkegaard
St. Thomas Aquinas