The Crossword of Life

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Across
  1. 2. The theory that nothing matters in the world
  2. 5. The study of existence and reality
  3. 6. The branch of philosophy concerned with reasoning
Down
  1. 1. Who was the philosopher to come up with Cogito, Ergo Sum
  2. 3. Moral principles that govern behavior
  3. 4. The ability to act at one's own discretion