Beware of a man of one book.

Related:

• Beware a man of one book. --
  English...
• Beware the man of one book. -- St.
  Thomas...
• Beware of a man's shadow and a bee's sting.
  Burmese...
• A man is not where he lives, but where he loves. -
  Latin...
• If there is no wind, row. --
  Latin...
• Beware of a man that does not talk and a dog that does not bark.
  Portuguese...
• Beware of a tall black man with one
  blond shoe...