Related:

• If you think before you speak, the other guy gets his joke in first.
• Think twice before you speak to a friend in need. -- Ambrose Bierce, "The Devil's Dictionary
• Think all you speak, but speak not all you think.
• Hear twice before you speak once.
• Think before you think! -- Stanislaw Lem
• The five rules of Socialism: 1. Don't think. 2. If you do think, don't speak.
  3. If you think and speak, don't write. 4. If you think, speak and write, don't sign....
• So, Two cheers for Democracy: one because it admits variety and two because it permits criticism.
  -- E. M. Forste...
• Think before you act; it's not your money.