Possible Clues:

• Arthur ____ wrote The World as Will and Idea
• The World as Will and Idea was written by Arthur ____
• Arthur ____ wrote Die Welt als Wille und Vorstellung
• Cheer up on ash (anag) — German philosopher. d. 1860
• Arthur —, philosopher
• Pessimist found mobile in Phones 4 U
• Philosopher -- punches a hero (anag.)
• Philosopher has terrible hour chase around writer
• Arthur -, nineteenth century German philosopher
• 19th century German philosopher