Related:

• Never ask a question unless the answer makes a difference. -- Anon.
• There is a saying among trial lawyers: "Never ask a question unless you are already SURE of the answer.
  For Dungeon Masters/Game Masters that should be Never roll the dice unless you're sure the outcome is acceptable....
• Never ask a question of a witness if you don't already know the answer. -- Old Adage
• If you know the answer to a question, don't ask. -- Petersen Nesbi
• If you were to ask me this question, what would my answer be?
• At five minutes before the hour, a student will ask a question requiring a ten minute answer.
  -- M. M. Johnsto...
• How will you know the answer to that question if you don't ask me out loud?
• The ability to ask the right question is more than half the battle of finding the answer.
  -- Thomas J. Watso...