Related:

• If you think before you speak, the other guy gets his joke in first.
• Think before you speak is criticism's motto; speak before you think, creation's. -- E. M. Forste
• If just one piece of mail gets lost, well, they'll just think they forgot to send it.
  But if *two* pieces of mail get lost, hell, they'll just think the other guy hasn't gotten around to answering his mail....
• If just one piece of mail gets lost, well, they'll just think they forgot to send it.
  But if *two* pieces of mail get lost, hell, they'll just think the other guy hasn't gotten around to answering his mail....
• If just one piece of mail gets lost, well, they'll just think they forgot to send it.
  But if *two* pieces of mail get lost, hell, they'll just think the other guy hasn't gotten around to answering his mail....
• Think all you speak, but speak not all you think.
• Think twice before you speak to a friend in need. -- Ambrose Bierce, "The Devil's Dictionary
• Hear twice before you speak once.