Complete the Severus Snape Quote- Book 1

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Across
  1. 7. Little foolish
  2. 8. Creep through
  3. 9. The subtle
  4. 10. Thought you wouldn't open
  5. 11. Its title is an oxymoron
Down
  1. 1. An infusion
  2. 2. Find me
  3. 3. The same plant, two other names
  4. 4. The difference between
  5. 5. Isn't everything
  6. 6. Harry Potter. Our new...