A man's ruin lies in his tongue.

Related:

• The wise man has long ears and a short tongue. --
  German...
• The wise man has long ears and a short tongue.
  German...
• When truth entails tremendous ruin,
  lies are pardoned...
• Many a man's tongue broke his nose. --
  Seamus...
• Do not rejoice over what has not yet happened.
  Egyptian...
• God gave man two ears and one tongue so that we listen twice as much as we speak.
  Arab...
• When God is planning ruin for a man,
  He first deprives him of his reason...
• Paradise for a happy man lies in his own good nature.
  Edward...
• A dog is man's best friend because he wags his tail,
  not his tongue...