Related:

• The man who has never been flogged has never been taught. -- Menande
• That which has not been taught directly can never be taught directly.
• No man is a good physician who has never been sick. Arab Proverb
• There is no such book, and never has been.
• It is better to be a has-been than one who never was.
• Forthoffer's Cynical Summary of Barzun's Laws 1) That which has not yet been taught directly can never be taught directly.
  2) If at first you don't succeed, you will never succeed....
• A virginal is a harpsichord that has never been plucked.
• A man can never quite understand a boy, even when he has been a boy.
  -- Gilbert K. Chesterson (1874-1936)...
• This is a crude version of a more advanced utility that has never been written.
  -- From the X-windows xwud(1) man-page...