Related:

• We hear and apprehend only what we already half know.
• After learning the tricks of the trade, many of us think we know the trade.
• Advice is what we ask for when we already know the answer and wish we didn't. -- Erica Mann Jong
• Advice is what we ask for when we already know the answer but wish we didn't." -- Erica Jong
• We will be better and braver if we engage and inquire than if we indulge in the idle fancy that we already know -- or that it is of no use seeking to know what we do not know.
  -- Plato (428-348? B.C.)...
• Learning is finding out what you already know -- Richard Bach
• Oh, we 're a' noddin', nid, nid, noddin'; Oh, we 're a' noddin' at our house at hame.
  -- Lady Nairne (1766-1845) -- We 're a' Noddin'...
• That we can comprehend the little we know already is mindboggling in itself. -- Tom Gate
• Scimus te prae litteras fatuum esse. (We know that you are mad with much learning.
  ) -- Petronius (d. c.66 A.D)...