Related:

• To teach is to learn.
• He who dares to teach must never cease to learn.
  -- John Cotton Dana, libraria (motto of Kean College of New Jersey)...
• Who ceases to be a friend, never was one.
• H. L. Mencken's Law Those who can -- do. Those who cannot -- teach.
  Those who cannot teach -- administrate. (Martin's extension)...
• H.L. Mencken's Law: Those who can -- do. Those who can't -- teach.
  Martin's Extension: Those who cannot teach -- administrate....
• To teach is to learn. -- Japanese Proverb
• He who can will. He who can't, will teach. -- M. M. Johnsto
• Those who can, do. Those who can't, teach. -- H. L.
  Mencken's Law Those who cannot teach -- administrate. -- Martin's Extensio...
• H. L. Mencken's Law: Those who can -- do. Those who can't -- teach.
  Martin's Extension: Those who cannot teach -- administrate....